[feat] add JSON and quiet output modes for models subcommands, update UI suppression logic, and enhance CLI test coverage

This reverts commit cd25b526c6.

.cargo/config.toml

@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: MIT
+
+[build]
+# Make target-dir consistent across workspace for better cache reuse.
+target-dir = "target"
+
+[profile.dev]
+opt-level = 1
+debug = true
+incremental = true
+
+[profile.release]
+# Reasonable defaults for CLI apps/libraries
+lto = "thin"
+codegen-units = 1
+strip = "debuginfo"
+opt-level = 3

.github/workflows/ci.yml

@@ -0,0 +1,33 @@
+name: CI
+
+on:
+  push:
+    branches: [ dev, main ]
+  pull_request:
+    branches: [ dev, main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache cargo registry and target
+        uses: Swatinem/rust-cache@v2
+
+      - name: Install components
+        run: rustup component add clippy rustfmt
+
+      - name: Cargo fmt
+        run: cargo fmt --all -- --check
+
+      - name: Clippy
+        run: cargo clippy --workspace --all-targets -- -D warnings
+
+      - name: Test
+        run: cargo test --workspace --all --locked
+

CHANGELOG.md

@@ -1,40 +1,14 @@
-# PolyScribe Refactor toward Rust 2024 — Incremental Patches
+# Changelog
 
-This changelog documents each incremental step applied to keep the build green while moving the codebase toward Rust 2024 idioms.
+All notable changes to this project will be documented in this file.
 
-## 1) Formatting only (rustfmt)
-- Ran `cargo fmt` across the repository.
-- No semantic changes.
-- Build status: OK (`cargo build` succeeded).
+The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.
 
-## 2) Lints — initial fixes (non-pedantic)
-- Adjusted crate lint policy in `src/lib.rs`:
-  - Replaced `#![warn(clippy::pedantic, clippy::nursery, clippy::cargo)]` with `#![warn(clippy::all)]` to align with the plan (skip pedantic/nursery for now).
-  - Added comment/TODO to revisit stricter lints in a later pass.
-- Fixed several clippy warnings that were causing `cargo clippy --all-targets` to error under tests:
-  - `src/backend.rs`: conditionally import `libloading::Library` only for non-test builds and mark `names` parameter as used in test cfg to avoid unused warnings; keep `check_lib()` side‑effect free during tests.
-  - `src/models.rs`: removed an unused `std::io::Write` import in test module.
-  - `src/main.rs` (unit tests): imported `polyscribe::format_srt_time` explicitly and removed a duplicate `use super::*;` to fix unresolved name and unused import warnings under clippy test builds.
-- Build/Clippy status:
-  - `cargo build`: OK.
-  - `cargo clippy --all-targets`: OK (only warnings remain; no errors).
+## Unreleased
 
-## 3) Module hygiene
-- Verified crate structure:
-  - Library crate (`src/lib.rs`) exposes a coherent API and re‑exports `backend` and `models` via `pub mod`.
-  - Binary (`src/main.rs`) consumes the library API through `polyscribe::...` paths.
-- No structural changes required. Build status: OK.
+### Changed
+- Docs: Replace `--download-models`/`--update-models` flags with `models download`/`models update` subcommands in `README.md`, `docs/usage.md`, and `docs/development.md`.
+- Host: Plugin discovery now scans `$XDG_DATA_HOME/polyscribe/plugins` (platform equivalent via `directories`) in addition to `PATH`.
+- CI: Add GitHub Actions workflow to run fmt, clippy (warnings as errors), and tests for pushes and PRs.
 
-## 4) Edition
-- The project already targets `edition = "2024"` in Cargo.toml.
-- Verified that the project compiles under Rust 2024. No changes needed.
-- TODO: If stricter lints or new features from 2024 edition introduce issues in future steps, document blockers here.
 
-## 5) Error handling
-- The codebase already returns `anyhow::Result` in the binary and uses contextual errors widely.
-- No `unwrap`/`expect` usages in production paths required attention in this pass.
-- Build status: OK.
-
-## Next planned steps (not yet applied in this changelog)
-- Gradually fix remaining clippy warnings (e.g., `uninlined_format_args`, small style nits) in small, compile‑green patches.
-- Optionally re‑enable `clippy::pedantic`, `clippy::nursery`, and `clippy::cargo` once warnings are significantly reduced, then address non‑breaking warnings.

CONTRIBUTING.md

@@ -1,32 +1,26 @@
-# Contributing to PolyScribe
+# Contributing
 
-Thanks for your interest in contributing! This guide explains the workflow and the checklist to follow before opening a Pull Request.
+Thank you for your interest in contributing!
 
-Workflow (fork → branch → PR)
-1) Fork the repository to your account.
-2) Create a feature branch:
-- git checkout -b feat/short-description
-3) Make changes with focused commits and good messages.
-4) Run the checklist below.
-5) Push and open a Pull Request against the main repository.
+Development setup
+- Install Rust via rustup.
+- Ensure ffmpeg is installed and available on PATH.
+- For GPU builds, install the appropriate runtime (CUDA/ROCm/Vulkan) and enable the matching features.
 
-Developer checklist (before opening a PR)
-- Build:
-  - cargo build (preferably without warnings)
-- Tests:
-  - cargo test (all tests pass)
-- Lints:
-  - cargo clippy --all-targets -- -D warnings (fix warnings)
-- Documentation:
-  - Update README/docs for user-visible changes
-  - Update CHANGELOG.md if applicable
-- Tests for changes:
-  - Add or update tests for bug fixes and new features where reasonable
+Coding guidelines
+- Prefer small, focused changes.
+- Add tests where reasonable.
+- Keep user-facing changes documented in README/docs.
+- Run clippy and fix warnings.
 
-Local development tips
-- Use `cargo run -- <args>` during development.
-- For faster feedback, keep examples in the examples/ folder handy.
-- Keep functions small and focused; prefer clear error messages with context.
+CI checklist
+- Build: cargo build --all-targets --locked
+- Tests: cargo test --all --locked
+- Lints: cargo clippy --all-targets -- -D warnings
+- Optional: smoke-run examples inline (from README):
+  - ./target/release/polyscribe --update-models --no-interaction -q
+  - ./target/release/polyscribe -o output samples/podcast_clip.mp3
 
-Code of conduct
-- Be respectful and constructive. Assume good intent.
+Notes
+- For GPU features, use --features gpu-cuda|gpu-hip|gpu-vulkan as needed in your local runs.
+- For docs-only changes, please still ensure the project builds.

Cargo.toml

@@ -1,34 +1,53 @@
-[package]
-name = "polyscribe"
-version = "0.1.0"
+[workspace]
+members = [
+    "crates/polyscribe-core",
+    "crates/polyscribe-protocol",
+    "crates/polyscribe-host",
+    "crates/polyscribe-cli",
+]
+resolver = "3"
+
+[workspace.package]
 edition = "2024"
+version = "0.1.0"
 license = "MIT"
-license-file = "LICENSE"
+rust-version = "1.89"
 
-[features]
-# Default: CPU only; no GPU features enabled
-default = []
-# GPU backends map to whisper-rs features or FFI stub for Vulkan
-gpu-cuda = ["whisper-rs/cuda"]
-gpu-hip = ["whisper-rs/hipblas"]
-gpu-vulkan = []
-# explicit CPU fallback feature (no effect at build time, used for clarity)
-cpu-fallback = []
-
-[dependencies]
-anyhow = "1.0.98"
-clap = { version = "4.5.43", features = ["derive"] }
-clap_complete = "4.5.28"
-clap_mangen = "0.2"
+# Optional: Keep dependency versions consistent across members
+[workspace.dependencies]
+thiserror = "1.0.69"
 serde = { version = "1.0.219", features = ["derive"] }
+anyhow = "1.0.99"
+libc = "0.2.175"
+toml = "0.8.23"
 serde_json = "1.0.142"
-toml = "0.8"
-chrono = { version = "0.4", features = ["clock"] }
-reqwest = { version = "0.12", features = ["blocking", "json"] }
-sha2 = "0.10"
-# whisper-rs is always used (CPU-only by default); GPU features map onto it
-whisper-rs = { git = "https://github.com/tazz4843/whisper-rs" }
-libc = "0.2"
+chrono = { version = "0.4.41", features = ["serde"] }
+sha2 = "0.10.9"
+which = "6.0.3"
+tokio = { version = "1.47.1", features = ["rt-multi-thread", "macros"] }
+clap = { version = "4.5.44", features = ["derive"] }
+directories = "5.0.1"
+whisper-rs = "0.14.3"
+cliclack = "0.3.6"
+clap_complete = "4.5.57"
+clap_mangen = "0.2.29"
 
-[dev-dependencies]
-tempfile = "3"
+# Additional shared deps used across members
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["fmt", "env-filter"] }
+reqwest = { version = "0.12.7", default-features = false, features = ["blocking", "rustls-tls", "gzip", "json"] }
+hex = "0.4.3"
+tempfile = "3.12.0"
+assert_cmd = "2.0.16"
+
+[workspace.lints.rust]
+unused_imports = "deny"
+dead_code = "warn"
+
+[profile.release]
+lto = "fat"
+codegen-units = 1
+panic = "abort"
+
+[profile.dev]
+panic = "unwind"

README.md

@@ -1,88 +1,68 @@
 # PolyScribe
 
-PolyScribe is a fast, local-first CLI for transcribing audio/video and merging existing JSON transcripts. It uses whisper-rs under the hood, can discover and download Whisper models automatically, and supports CPU and optional GPU backends (CUDA, ROCm/HIP, Vulkan).
+Local-first transcription and plugins.
 
-Key features
-- Transcribe audio and common video files using ffmpeg for audio extraction.
-- Merge multiple JSON transcripts, or merge and also keep per-file outputs.
-- Model management: interactive downloader and non-interactive updater with hash verification.
-- GPU backend selection at runtime; auto-detects available accelerators.
-- Clean outputs (JSON and SRT), speaker naming prompts, and useful logging controls.
+## Features
 
-Prerequisites
-- Rust toolchain (rustup recommended)
-- ffmpeg available on PATH
-- Optional for GPU acceleration at runtime: CUDA, ROCm/HIP, or Vulkan drivers (match your build features)
+- **Local-first**: Works offline with downloaded models
+- **Multiple backends**: CPU, CUDA, ROCm/HIP, and Vulkan support
+- **Plugin system**: Extensible via JSON-RPC plugins
+- **Model management**: Automatic download and verification of Whisper models
+- **Manifest caching**: Local cache for Hugging Face model manifests to reduce network requests
 
-Installation
-- Build from source (CPU-only by default):
-  - rustup install stable
-  - rustup default stable
-  - cargo build --release
-- Binary path: ./target/release/polyscribe
-- GPU builds (optional): build with features
-  - CUDA: cargo build --release --features gpu-cuda
-  - HIP: cargo build --release --features gpu-hip
-  - Vulkan: cargo build --release --features gpu-vulkan
+## Model Management
 
-Quickstart
-1) Download a model (first run can prompt you):
-- ./target/release/polyscribe --download-models
+PolyScribe automatically manages Whisper models from Hugging Face:
 
-2) Transcribe a file:
-- ./target/release/polyscribe -v -o output my_audio.mp3
-This writes JSON and SRT into the output directory with a date prefix.
+```bash
+# Download models interactively
+polyscribe models download
 
-Shell completions and man page
-- Completions: ./target/release/polyscribe completions <bash|zsh|fish|powershell|elvish> > polyscribe.<ext>
-  - Then install into your shell’s completion directory.
-- Man page: ./target/release/polyscribe man > polyscribe.1 (then copy to your manpath)
+# Update existing models
+polyscribe models update
 
-Model locations
-- Development (debug builds): ./models next to the project.
-- Packaged/release builds: $XDG_DATA_HOME/polyscribe/models or ~/.local/share/polyscribe/models.
-- Override via env var: POLYSCRIBE_MODELS_DIR=/path/to/models.
-- Force a specific model file via env var: WHISPER_MODEL=/path/to/model.bin.
+# Clear manifest cache (force fresh fetch)
+polyscribe models clear-cache
+```
 
-Most-used CLI flags
-- -o, --output FILE_OR_DIR: Output path base (date prefix added). If omitted, JSON prints to stdout.
-- -m, --merge: Merge all inputs into one output; otherwise one output per input.
-- --merge-and-separate: Write both merged output and separate per-input outputs (requires -o dir).
-- --set-speaker-names: Prompt for a speaker label per input file.
-- --update-models: Verify/update local models by size/hash against the upstream manifest.
-- --download-models: Interactive model list + multi-select download.
-- --language LANG: Language code hint (e.g., en, de). English-only models reject non-en hints.
-- --gpu-backend [auto|cpu|cuda|hip|vulkan]: Select backend (auto by default).
-- --gpu-layers N: Offload N layers to GPU when supported.
-- -v/--verbose (repeatable): Increase log verbosity. -vv shows very detailed logs.
-- -q/--quiet: Suppress non-error logs (stderr); does not silence stdout results.
-- --no-interaction: Never prompt; suitable for CI.
+### Manifest Caching
 
-Minimal usage examples
-- Transcribe an audio file to JSON/SRT:
-  - ./target/release/polyscribe -o output samples/podcast_clip.mp3
-- Merge multiple transcripts into one:
-  - ./target/release/polyscribe -m -o output merged input/a.json input/b.json
-- Update local models non-interactively (good for CI):
-  - ./target/release/polyscribe --update-models --no-interaction -q
+The Hugging Face model manifest is cached locally to avoid repeated network requests:
 
-Troubleshooting & docs
-- docs/faq.md – common issues and solutions (missing ffmpeg, GPU selection, model paths)
-- docs/usage.md – complete CLI reference and workflows
-- docs/development.md – build, run, and contribute locally
-- docs/design.md – architecture overview and decisions
-- docs/release-packaging.md – packaging notes for distributions
-- docs/ci.md – minimal CI checklist and job outline
-- CONTRIBUTING.md – PR checklist and workflow
+- **Default TTL**: 24 hours
+- **Cache location**: `$XDG_CACHE_HOME/polyscribe/manifest/` (or platform equivalent)
+- **Environment variables**:
+  - `POLYSCRIBE_NO_CACHE_MANIFEST=1`: Disable caching
+  - `POLYSCRIBE_MANIFEST_TTL_SECONDS=3600`: Set custom TTL (in seconds)
 
-CI status: [CI badge placeholder]
+## Installation
 
-Examples
-See the examples/ directory for copy-paste scripts:
-- examples/transcribe_file.sh
-- examples/update_models.sh
-- examples/download_models_interactive.sh
+```bash
+cargo install --path .
+```
 
-License
--------
-This project is licensed under the MIT License — see the LICENSE file for details.
+## Usage
+
+```bash
+# Transcribe audio/video
+polyscribe transcribe input.mp4
+
+# Merge multiple transcripts
+polyscribe transcribe --merge input1.json input2.json
+
+# Use specific GPU backend
+polyscribe transcribe --gpu-backend cuda input.mp4
+```
+
+## Development
+
+```bash
+# Build
+cargo build
+
+# Run tests
+cargo test
+
+# Run with verbose logging
+cargo run -- --verbose transcribe input.mp4
+```

crates/polyscribe-cli/Cargo.toml

@@ -0,0 +1,32 @@
+[package]
+name = "polyscribe-cli"
+version.workspace = true
+edition.workspace = true
+
+[[bin]]
+name = "polyscribe"
+path = "src/main.rs"
+
+[dependencies]
+anyhow = { workspace = true }
+clap = { workspace = true, features = ["derive"] }
+clap_complete = { workspace = true }
+clap_mangen = { workspace = true }
+directories = { workspace = true }
+serde = { workspace = true, features = ["derive"] }
+serde_json = { workspace = true }
+tokio = { workspace = true, features = ["rt-multi-thread", "macros", "process", "fs"] }
+tracing = { workspace = true }
+tracing-subscriber = { workspace = true, features = ["fmt", "env-filter"] }
+which = { workspace = true }
+
+polyscribe-core = { path = "../polyscribe-core" }
+polyscribe-host = { path = "../polyscribe-host" }
+polyscribe-protocol = { path = "../polyscribe-protocol" }
+
+[features]
+# Optional GPU-specific flags can be forwarded down to core/host if needed
+default = []
+
+[dev-dependencies]
+assert_cmd = { workspace = true }

crates/polyscribe-cli/src/cli.rs

@@ -0,0 +1,191 @@
+use clap::{Args, Parser, Subcommand, ValueEnum};
+use std::path::PathBuf;
+
+#[derive(Debug, Clone, ValueEnum)]
+pub enum GpuBackend {
+    Auto,
+    Cpu,
+    Cuda,
+    Hip,
+    Vulkan,
+}
+
+#[derive(Debug, Clone, Args)]
+pub struct OutputOpts {
+    /// Emit machine-readable JSON to stdout; suppress decorative logs
+    #[arg(long, global = true, action = clap::ArgAction::SetTrue)]
+    pub json: bool,
+    /// Reduce log chatter (errors only unless --json)
+    #[arg(long, global = true, action = clap::ArgAction::SetTrue)]
+    pub quiet: bool,
+}
+
+#[derive(Debug, Parser)]
+#[command(
+    name = "polyscribe",
+    version,
+    about = "PolyScribe – local-first transcription and plugins",
+    propagate_version = true,
+    arg_required_else_help = true,
+)]
+pub struct Cli {
+    /// Global output options
+    #[command(flatten)]
+    pub output: OutputOpts,
+
+    /// Increase verbosity (-v, -vv)
+    #[arg(short, long, action = clap::ArgAction::Count)]
+    pub verbose: u8,
+
+    /// Never prompt for user input (non-interactive mode)
+    #[arg(long, default_value_t = false)]
+    pub no_interaction: bool,
+
+    /// Disable progress bars/spinners
+    #[arg(long, default_value_t = false)]
+    pub no_progress: bool,
+
+    #[command(subcommand)]
+    pub command: Commands,
+}
+
+#[derive(Debug, Subcommand)]
+pub enum Commands {
+    /// Transcribe audio/video files or merge existing transcripts
+    Transcribe {
+        /// Output file or directory (date prefix is added when directory)
+        #[arg(short, long)]
+        output: Option<PathBuf>,
+
+        /// Merge multiple inputs into one output
+        #[arg(short = 'm', long, default_value_t = false)]
+        merge: bool,
+
+        /// Write both merged and per-input outputs (requires -o dir)
+        #[arg(long, default_value_t = false)]
+        merge_and_separate: bool,
+
+        /// Language code hint, e.g. en, de
+        #[arg(long)]
+        language: Option<String>,
+
+        /// Prompt for a speaker label per input file
+        #[arg(long, default_value_t = false)]
+        set_speaker_names: bool,
+
+        /// GPU backend selection
+        #[arg(long, value_enum, default_value_t = GpuBackend::Auto)]
+        gpu_backend: GpuBackend,
+
+        /// Offload N layers to GPU (when supported)
+        #[arg(long, default_value_t = 0)]
+        gpu_layers: usize,
+
+        /// Input paths: audio/video files or JSON transcripts
+        #[arg(required = true)]
+        inputs: Vec<PathBuf>,
+    },
+
+    /// Manage Whisper GGUF models (Hugging Face)
+    Models {
+        #[command(subcommand)]
+        cmd: ModelsCmd,
+    },
+
+    /// Discover and run plugins
+    Plugins {
+        #[command(subcommand)]
+        cmd: PluginsCmd,
+    },
+
+    /// Generate shell completions to stdout
+    Completions {
+        /// Shell to generate completions for
+        #[arg(value_parser = ["bash", "zsh", "fish", "powershell", "elvish"])]
+        shell: String,
+    },
+
+    /// Generate a man page to stdout
+    Man,
+}
+
+#[derive(Debug, Clone, Parser)]
+pub struct ModelCommon {
+    /// Concurrency for ranged downloads
+    #[arg(long, default_value_t = 4)]
+    pub concurrency: usize,
+    /// Limit download rate in bytes/sec (approximate)
+    #[arg(long)]
+    pub limit_rate: Option<u64>,
+}
+
+#[derive(Debug, Subcommand)]
+pub enum ModelsCmd {
+    /// List installed models (from manifest)
+    Ls {
+        #[command(flatten)]
+        common: ModelCommon,
+    },
+    /// Add or update a model
+    Add {
+        /// Hugging Face repo, e.g. ggml-org/models
+        repo: String,
+        /// File name in repo (e.g., gguf-tiny-q4_0.bin)
+        file: String,
+        #[command(flatten)]
+        common: ModelCommon,
+    },
+    /// Remove a model by alias
+    Rm {
+        alias: String,
+        #[command(flatten)]
+        common: ModelCommon,
+    },
+    /// Verify model file integrity by alias
+    Verify {
+        alias: String,
+        #[command(flatten)]
+        common: ModelCommon,
+    },
+    /// Update all models (HEAD + ETag; skip if unchanged)
+    Update {
+        #[command(flatten)]
+        common: ModelCommon,
+    },
+    /// Garbage-collect unreferenced files and stale manifest entries
+    Gc {
+        #[command(flatten)]
+        common: ModelCommon,
+    },
+    /// Search a repo for GGUF files
+    Search {
+        /// Hugging Face repo, e.g. ggml-org/models
+        repo: String,
+        /// Optional substring to filter filenames
+        #[arg(long)]
+        query: Option<String>,
+        #[command(flatten)]
+        common: ModelCommon,
+    },
+}
+
+#[derive(Debug, Subcommand)]
+pub enum PluginsCmd {
+    /// List installed plugins
+    List,
+    /// Show a plugin's capabilities (as JSON)
+    Info {
+        /// Plugin short name, e.g., "tubescribe"
+        name: String,
+    },
+    /// Run a plugin command (JSON-RPC over NDJSON via stdio)
+    Run {
+        /// Plugin short name
+        name: String,
+        /// Command name in plugin's API
+        command: String,
+        /// JSON payload string
+        #[arg(long)]
+        json: Option<String>,
+    },
+}

crates/polyscribe-cli/src/main.rs

@@ -0,0 +1,470 @@
+mod cli;
+mod output;
+
+use anyhow::{Context, Result, anyhow};
+use clap::{CommandFactory, Parser};
+use cli::{Cli, Commands, GpuBackend, ModelsCmd, ModelCommon, PluginsCmd};
+use output::OutputMode;
+use polyscribe_core::model_manager::{ModelManager, Settings, ReqwestClient};
+use polyscribe_core::ui;
+fn normalized_similarity(a: &str, b: &str) -> f64 {
+    // simple Levenshtein distance; normalized to [0,1]
+    let a_bytes = a.as_bytes();
+    let b_bytes = b.as_bytes();
+    let n = a_bytes.len();
+    let m = b_bytes.len();
+    if n == 0 && m == 0 { return 1.0; }
+    if n == 0 || m == 0 { return 0.0; }
+    let mut prev: Vec<usize> = (0..=m).collect();
+    let mut curr: Vec<usize> = vec![0; m + 1];
+    for i in 1..=n {
+        curr[0] = i;
+        for j in 1..=m {
+            let cost = if a_bytes[i - 1] == b_bytes[j - 1] { 0 } else { 1 };
+            curr[j] = (prev[j] + 1)
+                .min(curr[j - 1] + 1)
+                .min(prev[j - 1] + cost);
+        }
+        std::mem::swap(&mut prev, &mut curr);
+    }
+    let dist = prev[m] as f64;
+    let max_len = n.max(m) as f64;
+    1.0 - (dist / max_len)
+}
+
+fn human_size(bytes: Option<u64>) -> String {
+    match bytes {
+        Some(n) => {
+            let x = n as f64;
+            const KB: f64 = 1024.0;
+            const MB: f64 = 1024.0 * KB;
+            const GB: f64 = 1024.0 * MB;
+            if x >= GB { format!("{:.2} GiB", x / GB) }
+            else if x >= MB { format!("{:.2} MiB", x / MB) }
+            else if x >= KB { format!("{:.2} KiB", x / KB) }
+            else { format!("{} B", n) }
+        }
+        None => "?".to_string(),
+    }
+}
+use polyscribe_core::ui::progress::ProgressReporter;
+use polyscribe_host::PluginManager;
+use tokio::io::AsyncWriteExt;
+use tracing_subscriber::EnvFilter;
+
+fn init_tracing(json_mode: bool, quiet: bool, verbose: u8) {
+    // In JSON mode, suppress human logs; route errors to stderr only.
+    let level = if json_mode || quiet { "error" } else { match verbose { 0 => "info", 1 => "debug", _ => "trace" } };
+    let filter = EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new(level));
+    tracing_subscriber::fmt()
+        .with_env_filter(filter)
+        .with_target(false)
+        .with_level(true)
+        .with_writer(std::io::stderr)
+        .compact()
+        .init();
+}
+
+fn main() -> Result<()> {
+    let args = Cli::parse();
+
+    // Determine output mode early for logging and UI configuration
+    let output_mode = if args.output.json {
+        OutputMode::Json
+    } else {
+        OutputMode::Human { quiet: args.output.quiet }
+    };
+
+    init_tracing(matches!(output_mode, OutputMode::Json), args.output.quiet, args.verbose);
+
+    // Suppress decorative UI output in JSON mode as well
+    polyscribe_core::set_quiet(args.output.quiet || matches!(output_mode, OutputMode::Json));
+    polyscribe_core::set_no_interaction(args.no_interaction);
+    polyscribe_core::set_verbose(args.verbose);
+    polyscribe_core::set_no_progress(args.no_progress);
+
+    match args.command {
+        Commands::Transcribe {
+            gpu_backend,
+            gpu_layers,
+            inputs,
+            ..
+        } => {
+            polyscribe_core::ui::info("starting transcription workflow");
+            let mut progress = ProgressReporter::new(args.no_interaction);
+
+            progress.step("Validating inputs");
+            if inputs.is_empty() {
+                return Err(anyhow!("no inputs provided"));
+            }
+
+            progress.step("Selecting backend and preparing model");
+            match gpu_backend {
+                GpuBackend::Auto => {}
+                GpuBackend::Cpu => {}
+                GpuBackend::Cuda => {
+                    let _ = gpu_layers;
+                }
+                GpuBackend::Hip => {}
+                GpuBackend::Vulkan => {}
+            }
+
+            progress.finish_with_message("Transcription completed (stub)");
+            Ok(())
+        }
+
+        Commands::Models { cmd } => {
+            // predictable exit codes
+            const EXIT_OK: i32 = 0;
+            const EXIT_NOT_FOUND: i32 = 2;
+            const EXIT_NETWORK: i32 = 3;
+            const EXIT_VERIFY_FAILED: i32 = 4;
+            // const EXIT_NO_CHANGE: i32 = 5; // reserved
+
+            let handle_common = |c: &ModelCommon| Settings {
+                concurrency: c.concurrency.max(1),
+                limit_rate: c.limit_rate,
+                ..Default::default()
+            };
+
+            let exit = match cmd {
+                ModelsCmd::Ls { common } => {
+                    let mm: ModelManager<ReqwestClient> = ModelManager::new(handle_common(&common))?;
+                    let list = mm.ls()?;
+                    match output_mode {
+                        OutputMode::Json => {
+                            // Always emit JSON array (possibly empty)
+                            output_mode.print_json(&list);
+                        }
+                        OutputMode::Human { quiet } => {
+                            if list.is_empty() {
+                                if !quiet { println!("No models installed."); }
+                            } else {
+                                if !quiet { println!("Model (Repo)"); }
+                                for r in list {
+                                    if !quiet { println!("{} ({})", r.file, r.repo); }
+                                }
+                            }
+                        }
+                    }
+                    EXIT_OK
+                }
+                ModelsCmd::Add { repo, file, common } => {
+                    let settings = handle_common(&common);
+                    let mm: ModelManager<ReqwestClient> = ModelManager::new(settings.clone())?;
+                    // Derive an alias automatically from repo and file
+                    fn derive_alias(repo: &str, file: &str) -> String {
+                        use std::path::Path;
+                        let repo_tail = repo.rsplit('/').next().unwrap_or(repo);
+                        let stem = Path::new(file)
+                            .file_stem()
+                            .and_then(|s| s.to_str())
+                            .unwrap_or(file);
+                        format!("{}-{}", repo_tail, stem)
+                    }
+                    let alias = derive_alias(&repo, &file);
+                    match mm.add_or_update(&alias, &repo, &file) {
+                        Ok(rec) => {
+                            match output_mode {
+                                OutputMode::Json => output_mode.print_json(&rec),
+                                OutputMode::Human { quiet } => {
+                                    if !quiet { println!("installed: {} -> {}/{}", alias, repo, rec.file); }
+                                }
+                            }
+                            EXIT_OK
+                        }
+                        Err(e) => {
+                            // On not found or similar errors, try suggesting close matches interactively
+                            if matches!(output_mode, OutputMode::Json) || polyscribe_core::is_no_interaction() {
+                                match output_mode {
+                                    OutputMode::Json => {
+                                        // Emit error JSON object
+                                        #[derive(serde::Serialize)]
+                                        struct ErrObj<'a> { error: &'a str }
+                                        let eo = ErrObj { error: &e.to_string() };
+                                        output_mode.print_json(&eo);
+                                    }
+                                    _ => { eprintln!("error: {e}"); }
+                                }
+                                EXIT_NOT_FOUND
+                            } else {
+                                ui::warn(format!("{}", e));
+                                ui::info("Searching for similar model filenames…");
+                                match polyscribe_core::model_manager::search_repo(&repo, None) {
+                                    Ok(mut files) => {
+                                        if files.is_empty() {
+                                            ui::warn("No files found in repository.");
+                                            EXIT_NOT_FOUND
+                                        } else {
+                                            // rank by similarity
+                                            files.sort_by(|a, b| normalized_similarity(&file, b)
+                                                .partial_cmp(&normalized_similarity(&file, a))
+                                                .unwrap_or(std::cmp::Ordering::Equal));
+                                            let top: Vec<String> = files.into_iter().take(5).collect();
+                                            if top.is_empty() {
+                                                EXIT_NOT_FOUND
+                                            } else if top.len() == 1 {
+                                                let cand = &top[0];
+                                                // Fetch repo size list once
+                                                let size_map: std::collections::HashMap<String, Option<u64>> =
+                                                    polyscribe_core::model_manager::list_repo_files_with_meta(&repo)
+                                                    .unwrap_or_default()
+                                                    .into_iter().collect();
+                                                let mut size = size_map.get(cand).cloned().unwrap_or(None);
+                                                if size.is_none() {
+                                                    size = polyscribe_core::model_manager::head_len_for_file(&repo, cand);
+                                                }
+                                                let local_files: std::collections::HashSet<String> = mm.ls()?.into_iter().map(|r| r.file).collect();
+                                                let is_local = local_files.contains(cand);
+                                                let label = format!("{} [{}]{}", cand, human_size(size), if is_local { " (local)" } else { "" });
+                                                let ok = ui::prompt_confirm(&format!("Did you mean {}?", label), true)
+                                                    .unwrap_or(false);
+                                                if !ok { EXIT_NOT_FOUND } else {
+                                                    let mm2: ModelManager<ReqwestClient> = ModelManager::new(settings)?;
+                                                    let alias2 = derive_alias(&repo, cand);
+                                                    match mm2.add_or_update(&alias2, &repo, cand) {
+                                                        Ok(rec) => {
+                                                            match output_mode {
+                                                                OutputMode::Json => output_mode.print_json(&rec),
+                                                                OutputMode::Human { quiet } => { if !quiet { println!("installed: {} -> {}/{}", alias2, repo, rec.file); } }
+                                                            }
+                                                            EXIT_OK
+                                                        }
+                                                        Err(e2) => { eprintln!("error: {e2}"); EXIT_NETWORK }
+                                                    }
+                                                }
+                                            } else {
+                                                let opts: Vec<String> = top;
+                                                let local_files: std::collections::HashSet<String> = mm.ls()?.into_iter().map(|r| r.file).collect();
+                                                // Enrich labels with size and local tag using a single API call
+                                                let size_map: std::collections::HashMap<String, Option<u64>> =
+                                                    polyscribe_core::model_manager::list_repo_files_with_meta(&repo)
+                                                    .unwrap_or_default()
+                                                    .into_iter().collect();
+                                                let mut labels_owned: Vec<String> = Vec::new();
+                                                for f in &opts {
+                                                    let mut size = size_map.get(f).cloned().unwrap_or(None);
+                                                    if size.is_none() {
+                                                        size = polyscribe_core::model_manager::head_len_for_file(&repo, f);
+                                                    }
+                                                    let is_local = local_files.contains(f);
+                                                    let suffix = if is_local { " (local)" } else { "" };
+                                                    labels_owned.push(format!("{} [{}]{}", f, human_size(size), suffix));
+                                                }
+                                                let labels: Vec<&str> = labels_owned.iter().map(|s| s.as_str()).collect();
+                                                match ui::prompt_select("Pick a model", &labels) {
+                                                    Ok(idx) => {
+                                                        let chosen = &opts[idx];
+                                                        let mm2: ModelManager<ReqwestClient> = ModelManager::new(settings)?;
+                                                        let alias2 = derive_alias(&repo, chosen);
+                                                        match mm2.add_or_update(&alias2, &repo, chosen) {
+                                                            Ok(rec) => {
+                                                                match output_mode {
+                                                                    OutputMode::Json => output_mode.print_json(&rec),
+                                                                    OutputMode::Human { quiet } => { if !quiet { println!("installed: {} -> {}/{}", alias2, repo, rec.file); } }
+                                                                }
+                                                                EXIT_OK
+                                                            }
+                                                            Err(e2) => { eprintln!("error: {e2}"); EXIT_NETWORK }
+                                                        }
+                                                    }
+                                                    Err(_) => EXIT_NOT_FOUND,
+                                                }
+                                            }
+                                        }
+                                    }
+                                    Err(e2) => {
+                                        eprintln!("error: {}", e2);
+                                        EXIT_NETWORK
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+                ModelsCmd::Rm { alias, common } => {
+                    let mm: ModelManager<ReqwestClient> = ModelManager::new(handle_common(&common))?;
+                    let ok = mm.rm(&alias)?;
+                    match output_mode {
+                        OutputMode::Json => {
+                            #[derive(serde::Serialize)]
+                            struct R { removed: bool }
+                            output_mode.print_json(&R { removed: ok });
+                        }
+                        OutputMode::Human { quiet } => {
+                            if !quiet { println!("{}", if ok { "removed" } else { "not found" }); }
+                        }
+                    }
+                    if ok { EXIT_OK } else { EXIT_NOT_FOUND }
+                }
+                ModelsCmd::Verify { alias, common } => {
+                    let mm: ModelManager<ReqwestClient> = ModelManager::new(handle_common(&common))?;
+                    let found = mm.ls()?.into_iter().any(|r| r.alias == alias);
+                    if !found {
+                        match output_mode {
+                            OutputMode::Json => {
+                                #[derive(serde::Serialize)]
+                                struct R<'a> { ok: bool, error: &'a str }
+                                output_mode.print_json(&R { ok: false, error: "not found" });
+                            }
+                            OutputMode::Human { quiet } => { if !quiet { println!("not found"); } }
+                        }
+                        EXIT_NOT_FOUND
+                    } else {
+                        let ok = mm.verify(&alias)?;
+                        match output_mode {
+                            OutputMode::Json => {
+                                #[derive(serde::Serialize)]
+                                struct R { ok: bool }
+                                output_mode.print_json(&R { ok });
+                            }
+                            OutputMode::Human { quiet } => { if !quiet { println!("{}", if ok { "ok" } else { "corrupt" }); } }
+                        }
+                        if ok { EXIT_OK } else { EXIT_VERIFY_FAILED }
+                    }
+                }
+                ModelsCmd::Update { common } => {
+                    let mm: ModelManager<ReqwestClient> = ModelManager::new(handle_common(&common))?;
+                    let mut rc = EXIT_OK;
+                    for rec in mm.ls()? {
+                        match mm.add_or_update(&rec.alias, &rec.repo, &rec.file) {
+                            Ok(_) => {}
+                            Err(e) => {
+                                rc = EXIT_NETWORK;
+                                match output_mode {
+                                    OutputMode::Json => {
+                                        #[derive(serde::Serialize)]
+                                        struct R<'a> { alias: &'a str, error: String }
+                                        output_mode.print_json(&R { alias: &rec.alias, error: e.to_string() });
+                                    }
+                                    _ => { eprintln!("update {}: {e}", rec.alias); }
+                                }
+                            }
+                        }
+                    }
+                    rc
+                }
+                ModelsCmd::Gc { common } => {
+                    let mm: ModelManager<ReqwestClient> = ModelManager::new(handle_common(&common))?;
+                    let (files_removed, entries_removed) = mm.gc()?;
+                    match output_mode {
+                        OutputMode::Json => {
+                            #[derive(serde::Serialize)]
+                            struct R { files_removed: usize, entries_removed: usize }
+                            output_mode.print_json(&R { files_removed, entries_removed });
+                        }
+                        OutputMode::Human { quiet } => { if !quiet { println!("files_removed={} entries_removed={}", files_removed, entries_removed); } }
+                    }
+                    EXIT_OK
+                }
+                ModelsCmd::Search { repo, query, common } => {
+                    let res = polyscribe_core::model_manager::search_repo(&repo, query.as_deref());
+                    match res {
+                        Ok(files) => {
+                            match output_mode {
+                                OutputMode::Json => output_mode.print_json(&files),
+                                OutputMode::Human { quiet } => { for f in files { if !quiet { println!("{}", f); } } }
+                            }
+                            EXIT_OK
+                        }
+                        Err(e) => {
+                            match output_mode {
+                                OutputMode::Json => {
+                                    #[derive(serde::Serialize)]
+                                    struct R { error: String }
+                                    output_mode.print_json(&R { error: e.to_string() });
+                                }
+                                _ => { eprintln!("error: {e}"); }
+                            }
+                            EXIT_NETWORK
+                        }
+                    }
+                }
+            };
+            std::process::exit(exit);
+        }
+
+        Commands::Plugins { cmd } => {
+            let plugin_manager = PluginManager;
+
+            match cmd {
+                PluginsCmd::List => {
+                    let list = plugin_manager.list().context("discovering plugins")?;
+                    for item in list {
+                        polyscribe_core::ui::info(item.name);
+                    }
+                    Ok(())
+                }
+                PluginsCmd::Info { name } => {
+                    let info = plugin_manager
+                        .info(&name)
+                        .with_context(|| format!("getting info for {}", name))?;
+                    let info_json = serde_json::to_string_pretty(&info)?;
+                    polyscribe_core::ui::info(info_json);
+                    Ok(())
+                }
+                PluginsCmd::Run {
+                    name,
+                    command,
+                    json,
+                } => {
+                    // Use a local Tokio runtime only for this async path
+                    let rt = tokio::runtime::Builder::new_multi_thread()
+                        .enable_all()
+                        .build()
+                        .context("building tokio runtime")?;
+
+                    rt.block_on(async {
+                        let payload = json.unwrap_or_else(|| "{}".to_string());
+                        let mut child = plugin_manager
+                            .spawn(&name, &command)
+                            .with_context(|| format!("spawning plugin {name} {command}"))?;
+
+                        if let Some(mut stdin) = child.stdin.take() {
+                            stdin
+                                .write_all(payload.as_bytes())
+                                .await
+                                .context("writing JSON payload to plugin stdin")?;
+                        }
+
+                        let status = plugin_manager.forward_stdio(&mut child).await?;
+                        if !status.success() {
+                            polyscribe_core::ui::error(format!(
+                                "plugin returned non-zero exit code: {}",
+                                status
+                            ));
+                            return Err(anyhow!("plugin failed"));
+                        }
+                        Ok(())
+                    })
+                }
+            }
+        }
+
+        Commands::Completions { shell } => {
+            use clap_complete::{generate, shells};
+            use std::io;
+
+            let mut cmd = Cli::command();
+            let name = cmd.get_name().to_string();
+
+            match shell.as_str() {
+                "bash" => generate(shells::Bash, &mut cmd, name, &mut io::stdout()),
+                "zsh" => generate(shells::Zsh, &mut cmd, name, &mut io::stdout()),
+                "fish" => generate(shells::Fish, &mut cmd, name, &mut io::stdout()),
+                "powershell" => generate(shells::PowerShell, &mut cmd, name, &mut io::stdout()),
+                "elvish" => generate(shells::Elvish, &mut cmd, name, &mut io::stdout()),
+                _ => return Err(anyhow!("unsupported shell: {shell}")),
+            }
+            Ok(())
+        }
+
+        Commands::Man => {
+            use clap_mangen::Man;
+            let cmd = Cli::command();
+            let man = Man::new(cmd);
+            man.render(&mut std::io::stdout())?;
+            Ok(())
+        }
+    }
+}

crates/polyscribe-cli/src/output.rs

@@ -0,0 +1,36 @@
+use std::io::{self, Write};
+
+#[derive(Clone, Debug)]
+pub enum OutputMode {
+    Json,
+    Human { quiet: bool },
+}
+
+impl OutputMode {
+    pub fn is_quiet(&self) -> bool {
+        matches!(self, OutputMode::Json) || matches!(self, OutputMode::Human { quiet: true })
+    }
+
+    pub fn print_json<T: serde::Serialize>(&self, v: &T) {
+        if let OutputMode::Json = self {
+            // Write compact JSON to stdout without prefixes
+            // and ensure a trailing newline for CLI ergonomics
+            let s = serde_json::to_string(v).unwrap_or_else(|e| format!("\"JSON_ERROR:{}\"", e));
+            println!("{}", s);
+        }
+    }
+
+    pub fn print_line(&self, s: impl AsRef<str>) {
+        match self {
+            OutputMode::Json => {
+                // Suppress human lines in JSON mode
+            }
+            OutputMode::Human { quiet } => {
+                if !quiet {
+                    let _ = writeln!(io::stdout(), "{}", s.as_ref());
+                }
+            }
+        }
+    }
+}
+

crates/polyscribe-cli/tests/integration_aux.rs

@@ -1,10 +1,11 @@
 // SPDX-License-Identifier: MIT
 // Copyright (c) 2025 <COPYRIGHT HOLDER>. All rights reserved.
 
+use assert_cmd::cargo::cargo_bin;
 use std::process::Command;
 
-fn bin() -> &'static str {
-    env!("CARGO_BIN_EXE_polyscribe")
+fn bin() -> std::path::PathBuf {
+    cargo_bin("polyscribe")
 }
 
 #[test]

crates/polyscribe-cli/tests/models_smoke.rs

@@ -0,0 +1,42 @@
+use assert_cmd::cargo::cargo_bin;
+use std::process::Command;
+
+fn bin() -> std::path::PathBuf { cargo_bin("polyscribe") }
+
+#[test]
+fn models_help_shows_global_output_flags() {
+    let out = Command::new(bin())
+        .args(["models", "--help"]) // subcommand help
+        .output()
+        .expect("failed to run polyscribe models --help");
+    assert!(out.status.success(), "help exited non-zero: {:?}", out.status);
+    let stdout = String::from_utf8(out.stdout).expect("stdout not utf-8");
+    assert!(stdout.contains("--json"), "--json not shown in help: {stdout}");
+    assert!(stdout.contains("--quiet"), "--quiet not shown in help: {stdout}");
+}
+
+#[test]
+fn models_version_contains_pkg_version() {
+    let out = Command::new(bin())
+        .args(["models", "--version"]) // propagate_version
+        .output()
+        .expect("failed to run polyscribe models --version");
+    assert!(out.status.success(), "version exited non-zero: {:?}", out.status);
+    let stdout = String::from_utf8(out.stdout).expect("stdout not utf-8");
+    let want = env!("CARGO_PKG_VERSION");
+    assert!(stdout.contains(want), "version output missing {want}: {stdout}");
+}
+
+#[test]
+fn models_ls_json_quiet_emits_pure_json() {
+    let out = Command::new(bin())
+        .args(["models", "ls", "--json", "--quiet"]) // global flags
+        .output()
+        .expect("failed to run polyscribe models ls --json --quiet");
+    assert!(out.status.success(), "ls exited non-zero: {:?}", out.status);
+    let stdout = String::from_utf8(out.stdout).expect("stdout not utf-8");
+    serde_json::from_str::<serde_json::Value>(stdout.trim()).expect("stdout is not valid JSON");
+    // Expect no extra logs on stdout; stderr should be empty in success path
+    assert!(out.stderr.is_empty(), "expected no stderr noise");
+}
+

crates/polyscribe-core/Cargo.toml

@@ -0,0 +1,22 @@
+[package]
+name = "polyscribe-core"
+version.workspace = true
+edition.workspace = true
+
+[dependencies]
+anyhow = { workspace = true }
+thiserror = { workspace = true }
+serde = { workspace = true, features = ["derive"] }
+serde_json = { workspace = true }
+toml = { workspace = true }
+directories = { workspace = true }
+chrono = { workspace = true }
+libc = { workspace = true }
+whisper-rs = { workspace = true }
+# UI and progress
+cliclack = { workspace = true }
+# HTTP downloads + hashing
+reqwest = { workspace = true }
+sha2 = { workspace = true }
+hex = { workspace = true }
+tempfile = { workspace = true }

crates/polyscribe-core/build.rs

@@ -1,15 +1,14 @@
 // SPDX-License-Identifier: MIT
-// Copyright (c) 2025 <COPYRIGHT HOLDER>. All rights reserved.
 
 fn main() {
-    // Only run special build steps when gpu-vulkan feature is enabled.
     let vulkan_enabled = std::env::var("CARGO_FEATURE_GPU_VULKAN").is_ok();
+    println!("cargo:rerun-if-changed=extern/whisper.cpp");
     if !vulkan_enabled {
+        println!(
+            "cargo:warning=gpu-vulkan feature is disabled; skipping Vulkan-dependent build steps."
+        );
         return;
     }
-    // Placeholder: In a full implementation, we would invoke CMake for whisper.cpp with GGML_VULKAN=1.
-    // For now, emit a helpful note. Build will proceed; runtime Vulkan backend returns an explanatory error.
-    println!("cargo:rerun-if-changed=extern/whisper.cpp");
     println!(
         "cargo:warning=Building with gpu-vulkan: ensure Vulkan SDK/loader are installed. Future versions will compile whisper.cpp via CMake."
     );

crates/polyscribe-core/src/backend.rs

@@ -0,0 +1,303 @@
+// SPDX-License-Identifier: MIT
+
+use crate::OutputEntry;
+use crate::prelude::*;
+use crate::{decode_audio_to_pcm_f32_ffmpeg, find_model_file};
+use anyhow::{Context, anyhow};
+use std::env;
+use std::path::Path;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum BackendKind {
+    Auto,
+    Cpu,
+    Cuda,
+    Hip,
+    Vulkan,
+}
+
+pub trait TranscribeBackend {
+    fn kind(&self) -> BackendKind;
+    fn transcribe(
+        &self,
+        audio_path: &Path,
+        speaker: &str,
+        language: Option<&str>,
+        gpu_layers: Option<u32>,
+        progress: Option<&(dyn Fn(i32) + Send + Sync)>,
+    ) -> Result<Vec<OutputEntry>>;
+}
+
+fn is_library_available(_names: &[&str]) -> bool {
+    #[cfg(test)]
+    {
+        false
+    }
+    #[cfg(not(test))]
+    {
+        false
+    }
+}
+
+fn cuda_available() -> bool {
+    if let Ok(x) = env::var("POLYSCRIBE_TEST_FORCE_CUDA") {
+        return x == "1";
+    }
+    is_library_available(&[
+        "libcudart.so",
+        "libcudart.so.12",
+        "libcudart.so.11",
+        "libcublas.so",
+        "libcublas.so.12",
+    ])
+}
+
+fn hip_available() -> bool {
+    if let Ok(x) = env::var("POLYSCRIBE_TEST_FORCE_HIP") {
+        return x == "1";
+    }
+    is_library_available(&["libhipblas.so", "librocblas.so"])
+}
+
+fn vulkan_available() -> bool {
+    if let Ok(x) = env::var("POLYSCRIBE_TEST_FORCE_VULKAN") {
+        return x == "1";
+    }
+    is_library_available(&["libvulkan.so.1", "libvulkan.so"])
+}
+
+#[derive(Default)]
+pub struct CpuBackend;
+#[derive(Default)]
+pub struct CudaBackend;
+#[derive(Default)]
+pub struct HipBackend;
+#[derive(Default)]
+pub struct VulkanBackend;
+
+macro_rules! impl_whisper_backend {
+    ($ty:ty, $kind:expr) => {
+        impl TranscribeBackend for $ty {
+            fn kind(&self) -> BackendKind {
+                $kind
+            }
+            fn transcribe(
+                &self,
+                audio_path: &Path,
+                speaker: &str,
+                language: Option<&str>,
+                _gpu_layers: Option<u32>,
+                progress: Option<&(dyn Fn(i32) + Send + Sync)>,
+            ) -> Result<Vec<OutputEntry>> {
+                transcribe_with_whisper_rs(audio_path, speaker, language, progress)
+            }
+        }
+    };
+}
+
+impl_whisper_backend!(CpuBackend, BackendKind::Cpu);
+impl_whisper_backend!(CudaBackend, BackendKind::Cuda);
+impl_whisper_backend!(HipBackend, BackendKind::Hip);
+
+impl TranscribeBackend for VulkanBackend {
+    fn kind(&self) -> BackendKind {
+        BackendKind::Vulkan
+    }
+    fn transcribe(
+        &self,
+        _audio_path: &Path,
+        _speaker: &str,
+        _language: Option<&str>,
+        _gpu_layers: Option<u32>,
+        _progress: Option<&(dyn Fn(i32) + Send + Sync)>,
+    ) -> Result<Vec<OutputEntry>> {
+        Err(anyhow!(
+            "Vulkan backend not yet wired to whisper.cpp FFI. Build with --features gpu-vulkan and ensure Vulkan SDK is installed. How to fix: install Vulkan loader (libvulkan), set VULKAN_SDK, and run cargo build --features gpu-vulkan."
+        ).into())
+    }
+}
+
+pub struct BackendSelection {
+    pub backend: Box<dyn TranscribeBackend + Send + Sync>,
+    pub chosen: BackendKind,
+    pub detected: Vec<BackendKind>,
+}
+
+pub fn select_backend(requested: BackendKind, verbose: bool) -> Result<BackendSelection> {
+    let mut detected = Vec::new();
+    if cuda_available() {
+        detected.push(BackendKind::Cuda);
+    }
+    if hip_available() {
+        detected.push(BackendKind::Hip);
+    }
+    if vulkan_available() {
+        detected.push(BackendKind::Vulkan);
+    }
+
+    let instantiate_backend = |k: BackendKind| -> Box<dyn TranscribeBackend + Send + Sync> {
+        match k {
+            BackendKind::Cpu => Box::new(CpuBackend),
+            BackendKind::Cuda => Box::new(CudaBackend),
+            BackendKind::Hip => Box::new(HipBackend),
+            BackendKind::Vulkan => Box::new(VulkanBackend),
+            BackendKind::Auto => Box::new(CpuBackend),
+        }
+    };
+
+    let chosen = match requested {
+        BackendKind::Auto => {
+            if detected.contains(&BackendKind::Cuda) {
+                BackendKind::Cuda
+            } else if detected.contains(&BackendKind::Hip) {
+                BackendKind::Hip
+            } else if detected.contains(&BackendKind::Vulkan) {
+                BackendKind::Vulkan
+            } else {
+                BackendKind::Cpu
+            }
+        }
+        BackendKind::Cuda => {
+            if detected.contains(&BackendKind::Cuda) {
+                BackendKind::Cuda
+            } else {
+                return Err(anyhow!(
+                    "Requested CUDA backend but CUDA libraries/devices not detected. How to fix: install NVIDIA driver + CUDA toolkit, ensure libcudart/libcublas are in loader path, and build with --features gpu-cuda."
+                ).into());
+            }
+        }
+        BackendKind::Hip => {
+            if detected.contains(&BackendKind::Hip) {
+                BackendKind::Hip
+            } else {
+                return Err(anyhow!(
+                    "Requested ROCm/HIP backend but libraries/devices not detected. How to fix: install ROCm hipBLAS/rocBLAS, ensure libs are in loader path, and build with --features gpu-hip."
+                ).into());
+            }
+        }
+        BackendKind::Vulkan => {
+            if detected.contains(&BackendKind::Vulkan) {
+                BackendKind::Vulkan
+            } else {
+                return Err(anyhow!(
+                    "Requested Vulkan backend but libvulkan not detected. How to fix: install Vulkan loader/SDK and build with --features gpu-vulkan."
+                ).into());
+            }
+        }
+        BackendKind::Cpu => BackendKind::Cpu,
+    };
+
+    if verbose {
+        crate::dlog!(1, "Detected backends: {:?}", detected);
+        crate::dlog!(1, "Selected backend: {:?}", chosen);
+    }
+
+    Ok(BackendSelection {
+        backend: instantiate_backend(chosen),
+        chosen,
+        detected,
+    })
+}
+
+#[allow(clippy::too_many_arguments)]
+pub(crate) fn transcribe_with_whisper_rs(
+    audio_path: &Path,
+    speaker: &str,
+    language: Option<&str>,
+    progress: Option<&(dyn Fn(i32) + Send + Sync)>,
+) -> Result<Vec<OutputEntry>> {
+    let report = |p: i32| {
+        if let Some(cb) = progress {
+            cb(p);
+        }
+    };
+    report(0);
+
+    let pcm_samples = decode_audio_to_pcm_f32_ffmpeg(audio_path)?;
+    report(5);
+
+    let model_path = find_model_file()?;
+    let english_only_model = model_path
+        .file_name()
+        .and_then(|s| s.to_str())
+        .map(|s| s.contains(".en.") || s.ends_with(".en.bin"))
+        .unwrap_or(false);
+    if let Some(lang) = language
+        && english_only_model
+        && lang != "en"
+    {
+        return Err(anyhow!(
+            "Selected model is English-only ({}), but a non-English language hint '{}' was provided. Please use a multilingual model or set WHISPER_MODEL.",
+            model_path.display(),
+            lang
+        ).into());
+    }
+    let model_path_str = model_path
+        .to_str()
+        .ok_or_else(|| anyhow!("Model path not valid UTF-8: {}", model_path.display()))?;
+
+    if crate::verbose_level() < 2 {
+        unsafe {
+            std::env::set_var("GGML_LOG_LEVEL", "0");
+            std::env::set_var("WHISPER_PRINT_PROGRESS", "0");
+        }
+    }
+
+    let (_context, mut state) = crate::with_suppressed_stderr(|| {
+        let params = whisper_rs::WhisperContextParameters::default();
+        let context = whisper_rs::WhisperContext::new_with_params(model_path_str, params)
+            .with_context(|| format!("Failed to load Whisper model at {}", model_path.display()))?;
+        let state = context
+            .create_state()
+            .map_err(|e| anyhow!("Failed to create Whisper state: {:?}", e))?;
+        Ok::<_, anyhow::Error>((context, state))
+    })?;
+    report(20);
+
+    let mut full_params =
+        whisper_rs::FullParams::new(whisper_rs::SamplingStrategy::Greedy { best_of: 1 });
+    let threads = std::thread::available_parallelism()
+        .map(|n| n.get() as i32)
+        .unwrap_or(1);
+    full_params.set_n_threads(threads);
+    full_params.set_translate(false);
+    if let Some(lang) = language {
+        full_params.set_language(Some(lang));
+    }
+    report(30);
+
+    crate::with_suppressed_stderr(|| {
+        report(40);
+        state
+            .full(full_params, &pcm_samples)
+            .map_err(|e| anyhow!("Whisper full() failed: {:?}", e))
+    })?;
+
+    report(90);
+    let num_segments = state
+        .full_n_segments()
+        .map_err(|e| anyhow!("Failed to get segments: {:?}", e))?;
+    let mut entries = Vec::new();
+    for seg_idx in 0..num_segments {
+        let segment_text = state
+            .full_get_segment_text(seg_idx)
+            .map_err(|e| anyhow!("Failed to get segment text: {:?}", e))?;
+        let t0 = state
+            .full_get_segment_t0(seg_idx)
+            .map_err(|e| anyhow!("Failed to get segment t0: {:?}", e))?;
+        let t1 = state
+            .full_get_segment_t1(seg_idx)
+            .map_err(|e| anyhow!("Failed to get segment t1: {:?}", e))?;
+        let start = (t0 as f64) * 0.01;
+        let end = (t1 as f64) * 0.01;
+        entries.push(OutputEntry {
+            id: 0,
+            speaker: speaker.to_string(),
+            start,
+            end,
+            text: segment_text.trim().to_string(),
+        });
+    }
+    report(100);
+    Ok(entries)
+}

crates/polyscribe-core/src/config.rs

@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: MIT
+
+use serde::{Deserialize, Serialize};
+use std::env;
+use std::path::PathBuf;
+
+pub struct ConfigService;
+
+impl ConfigService {
+    pub const ENV_NO_CACHE_MANIFEST: &'static str = "POLYSCRIBE_NO_CACHE_MANIFEST";
+    pub const ENV_MANIFEST_TTL_SECONDS: &'static str = "POLYSCRIBE_MANIFEST_TTL_SECONDS";
+    pub const ENV_MODELS_DIR: &'static str = "POLYSCRIBE_MODELS_DIR";
+    pub const ENV_USER_AGENT: &'static str = "POLYSCRIBE_USER_AGENT";
+    pub const ENV_HTTP_TIMEOUT_SECS: &'static str = "POLYSCRIBE_HTTP_TIMEOUT_SECS";
+    pub const ENV_HF_REPO: &'static str = "POLYSCRIBE_HF_REPO";
+    pub const ENV_CACHE_FILENAME: &'static str = "POLYSCRIBE_MANIFEST_CACHE_FILENAME";
+
+    pub const DEFAULT_USER_AGENT: &'static str = "polyscribe/0.1";
+    pub const DEFAULT_DOWNLOADER_UA: &'static str = "polyscribe-model-downloader/1";
+    pub const DEFAULT_HF_REPO: &'static str = "ggerganov/whisper.cpp";
+    pub const DEFAULT_CACHE_FILENAME: &'static str = "hf_manifest_whisper_cpp.json";
+    pub const DEFAULT_HTTP_TIMEOUT_SECS: u64 = 8;
+    pub const DEFAULT_MANIFEST_CACHE_TTL_SECONDS: u64 = 24 * 60 * 60;
+
+    pub fn project_dirs() -> Option<directories::ProjectDirs> {
+        directories::ProjectDirs::from("dev", "polyscribe", "polyscribe")
+    }
+
+    pub fn default_models_dir() -> Option<PathBuf> {
+        Self::project_dirs().map(|d| d.data_dir().join("models"))
+    }
+
+    pub fn default_plugins_dir() -> Option<PathBuf> {
+        Self::project_dirs().map(|d| d.data_dir().join("plugins"))
+    }
+
+    pub fn manifest_cache_dir() -> Option<PathBuf> {
+        Self::project_dirs().map(|d| d.cache_dir().join("manifest"))
+    }
+
+    pub fn bypass_manifest_cache() -> bool {
+        env::var(Self::ENV_NO_CACHE_MANIFEST).is_ok()
+    }
+
+    pub fn manifest_cache_ttl_seconds() -> u64 {
+        env::var(Self::ENV_MANIFEST_TTL_SECONDS)
+            .ok()
+            .and_then(|s| s.parse::<u64>().ok())
+            .unwrap_or(Self::DEFAULT_MANIFEST_CACHE_TTL_SECONDS)
+    }
+
+    pub fn manifest_cache_filename() -> String {
+        env::var(Self::ENV_CACHE_FILENAME)
+            .unwrap_or_else(|_| Self::DEFAULT_CACHE_FILENAME.to_string())
+    }
+
+    pub fn models_dir(cfg: Option<&Config>) -> Option<PathBuf> {
+        if let Ok(env_dir) = env::var(Self::ENV_MODELS_DIR) {
+            if !env_dir.is_empty() {
+                return Some(PathBuf::from(env_dir));
+            }
+        }
+        if let Some(c) = cfg {
+            if let Some(dir) = c.models_dir.clone() {
+                return Some(dir);
+            }
+        }
+        Self::default_models_dir()
+    }
+
+    pub fn user_agent() -> String {
+        env::var(Self::ENV_USER_AGENT).unwrap_or_else(|_| Self::DEFAULT_USER_AGENT.to_string())
+    }
+
+    pub fn downloader_user_agent() -> String {
+        env::var(Self::ENV_USER_AGENT).unwrap_or_else(|_| Self::DEFAULT_DOWNLOADER_UA.to_string())
+    }
+
+    pub fn http_timeout_secs() -> u64 {
+        env::var(Self::ENV_HTTP_TIMEOUT_SECS)
+            .ok()
+            .and_then(|s| s.parse::<u64>().ok())
+            .unwrap_or(Self::DEFAULT_HTTP_TIMEOUT_SECS)
+    }
+
+    pub fn hf_repo() -> String {
+        env::var(Self::ENV_HF_REPO).unwrap_or_else(|_| Self::DEFAULT_HF_REPO.to_string())
+    }
+
+    pub fn hf_api_base_for(repo: &str) -> String {
+        format!("https://huggingface.co/api/models/{}", repo)
+    }
+
+    pub fn manifest_cache_path() -> Option<PathBuf> {
+        let dir = Self::manifest_cache_dir()?;
+        Some(dir.join(Self::manifest_cache_filename()))
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+pub struct Config {
+    pub models_dir: Option<PathBuf>,
+    pub plugins_dir: Option<PathBuf>,
+}

crates/polyscribe-core/src/error.rs

@@ -0,0 +1,31 @@
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum Error {
+    #[error("I/O error: {0}")]
+    Io(#[from] std::io::Error),
+
+    #[error("serde error: {0}")]
+    Serde(#[from] serde_json::Error),
+
+    #[error("toml error: {0}")]
+    Toml(#[from] toml::de::Error),
+
+    #[error("toml ser error: {0}")]
+    TomlSer(#[from] toml::ser::Error),
+
+    #[error("env var error: {0}")]
+    EnvVar(#[from] std::env::VarError),
+
+    #[error("http error: {0}")]
+    Http(#[from] reqwest::Error),
+
+    #[error("other: {0}")]
+    Other(String),
+}
+
+impl From<anyhow::Error> for Error {
+    fn from(e: anyhow::Error) -> Self {
+        Error::Other(e.to_string())
+    }
+}

crates/polyscribe-core/src/lib.rs

@@ -0,0 +1,442 @@
+// SPDX-License-Identifier: MIT
+
+#![forbid(elided_lifetimes_in_paths)]
+#![forbid(unused_must_use)]
+#![warn(clippy::all)]
+
+use std::sync::atomic::{AtomicBool, AtomicU8, Ordering};
+
+use crate::prelude::*;
+use anyhow::{Context, anyhow};
+use chrono::Local;
+use std::env;
+use std::path::{Path, PathBuf};
+use std::process::Command;
+
+#[cfg(unix)]
+use libc::{O_WRONLY, close, dup, dup2, open};
+
+static QUIET: AtomicBool = AtomicBool::new(false);
+static NO_INTERACTION: AtomicBool = AtomicBool::new(false);
+static VERBOSE: AtomicU8 = AtomicU8::new(0);
+static NO_PROGRESS: AtomicBool = AtomicBool::new(false);
+
+pub fn set_quiet(enabled: bool) {
+    QUIET.store(enabled, Ordering::Relaxed);
+}
+pub fn is_quiet() -> bool {
+    QUIET.load(Ordering::Relaxed)
+}
+
+pub fn set_no_interaction(enabled: bool) {
+    NO_INTERACTION.store(enabled, Ordering::Relaxed);
+}
+pub fn is_no_interaction() -> bool {
+    NO_INTERACTION.load(Ordering::Relaxed)
+}
+
+pub fn set_verbose(level: u8) {
+    VERBOSE.store(level, Ordering::Relaxed);
+}
+pub fn verbose_level() -> u8 {
+    VERBOSE.load(Ordering::Relaxed)
+}
+
+pub fn set_no_progress(enabled: bool) {
+    NO_PROGRESS.store(enabled, Ordering::Relaxed);
+}
+pub fn is_no_progress() -> bool {
+    NO_PROGRESS.load(Ordering::Relaxed)
+}
+
+pub fn stdin_is_tty() -> bool {
+    use std::io::IsTerminal as _;
+    std::io::stdin().is_terminal()
+}
+
+pub struct StderrSilencer {
+    #[cfg(unix)]
+    old_stderr_fd: i32,
+    #[cfg(unix)]
+    devnull_fd: i32,
+    active: bool,
+}
+
+impl StderrSilencer {
+    pub fn activate_if_quiet() -> Self {
+        if !is_quiet() {
+            return Self {
+                active: false,
+                #[cfg(unix)]
+                old_stderr_fd: -1,
+                #[cfg(unix)]
+                devnull_fd: -1,
+            };
+        }
+        Self::activate()
+    }
+
+    pub fn activate() -> Self {
+        #[cfg(unix)]
+        unsafe {
+            let old_fd = dup(2);
+            if old_fd < 0 {
+                return Self {
+                    active: false,
+                    old_stderr_fd: -1,
+                    devnull_fd: -1,
+                };
+            }
+            let devnull_cstr = std::ffi::CString::new("/dev/null").unwrap();
+            let devnull_fd = open(devnull_cstr.as_ptr(), O_WRONLY);
+            if devnull_fd < 0 {
+                let _ = close(old_fd);
+                return Self {
+                    active: false,
+                    old_stderr_fd: -1,
+                    devnull_fd: -1,
+                };
+            }
+            if dup2(devnull_fd, 2) < 0 {
+                let _ = close(devnull_fd);
+                let _ = close(old_fd);
+                return Self {
+                    active: false,
+                    old_stderr_fd: -1,
+                    devnull_fd: -1,
+                };
+            }
+            Self {
+                active: true,
+                old_stderr_fd: old_fd,
+                devnull_fd,
+            }
+        }
+        #[cfg(not(unix))]
+        {
+            Self { active: false }
+        }
+    }
+}
+
+impl Drop for StderrSilencer {
+    fn drop(&mut self) {
+        if !self.active {
+            return;
+        }
+        #[cfg(unix)]
+        unsafe {
+            let _ = dup2(self.old_stderr_fd, 2);
+            let _ = close(self.old_stderr_fd);
+            let _ = close(self.devnull_fd);
+        }
+    }
+}
+
+pub fn with_suppressed_stderr<F, T>(f: F) -> T
+where
+    F: FnOnce() -> T,
+{
+    let silencer = StderrSilencer::activate_if_quiet();
+    let result = f();
+    drop(silencer);
+    result
+}
+
+#[macro_export]
+macro_rules! elog {
+    ($($arg:tt)*) => {{ $crate::ui::error(format!($($arg)*)); }}
+}
+
+#[macro_export]
+macro_rules! ilog {
+    ($($arg:tt)*) => {{
+        if !$crate::is_quiet() { $crate::ui::info(format!($($arg)*)); }
+    }}
+}
+
+#[macro_export]
+macro_rules! dlog {
+    ($lvl:expr, $($arg:tt)*) => {{
+        if !$crate::is_quiet() && $crate::verbose_level() >= $lvl { $crate::ui::info(format!("DEBUG{}: {}", $lvl, format!($($arg)*))); }
+    }}
+}
+
+
+pub mod backend;
+pub mod config;
+pub mod models;
+pub mod error;
+pub mod ui;
+pub use error::Error;
+pub mod prelude;
+
+#[derive(Debug, serde::Serialize, Clone)]
+pub struct OutputEntry {
+    pub id: u64,
+    pub speaker: String,
+    pub start: f64,
+    pub end: f64,
+    pub text: String,
+}
+
+pub fn date_prefix() -> String {
+    Local::now().format("%Y-%m-%d").to_string()
+}
+
+pub fn format_srt_time(seconds: f64) -> String {
+    let total_ms = (seconds * 1000.0).round() as i64;
+    let ms = total_ms % 1000;
+    let total_secs = total_ms / 1000;
+    let sec = total_secs % 60;
+    let min = (total_secs / 60) % 60;
+    let hour = total_secs / 3600;
+    format!("{hour:02}:{min:02}:{sec:02},{ms:03}")
+}
+
+pub fn render_srt(entries: &[OutputEntry]) -> String {
+    let mut srt = String::new();
+    for (index, entry) in entries.iter().enumerate() {
+        let srt_index = index + 1;
+        srt.push_str(&format!("{srt_index}\n"));
+        srt.push_str(&format!(
+            "{} --> {}\n",
+            format_srt_time(entry.start),
+            format_srt_time(entry.end)
+        ));
+        if !entry.speaker.is_empty() {
+            srt.push_str(&format!("{}: {}\n", entry.speaker, entry.text));
+        } else {
+            srt.push_str(&format!("{}\n", entry.text));
+        }
+        srt.push('\n');
+    }
+    srt
+}
+
+pub mod model_manager;
+
+pub fn models_dir_path() -> PathBuf {
+    if let Ok(env_val) = env::var("POLYSCRIBE_MODELS_DIR") {
+        let env_path = PathBuf::from(env_val);
+        if !env_path.as_os_str().is_empty() {
+            return env_path;
+        }
+    }
+    if cfg!(debug_assertions) {
+        return PathBuf::from("models");
+    }
+    if let Ok(xdg) = env::var("XDG_DATA_HOME")
+        && !xdg.is_empty()
+    {
+        return PathBuf::from(xdg).join("polyscribe").join("models");
+    }
+    if let Ok(home) = env::var("HOME")
+        && !home.is_empty()
+    {
+        return PathBuf::from(home)
+            .join(".local")
+            .join("share")
+            .join("polyscribe")
+            .join("models");
+    }
+    PathBuf::from("models")
+}
+
+pub fn normalize_lang_code(input: &str) -> Option<String> {
+    let mut lang = input.trim().to_lowercase();
+    if lang.is_empty() || lang == "auto" || lang == "c" || lang == "posix" {
+        return None;
+    }
+    if let Some((prefix, _)) = lang.split_once('.') {
+        lang = prefix.to_string();
+    }
+    if let Some((prefix, _)) = lang.split_once('_') {
+        lang = prefix.to_string();
+    }
+    let code = match lang.as_str() {
+        "en" => "en",
+        "de" => "de",
+        "es" => "es",
+        "fr" => "fr",
+        "it" => "it",
+        "pt" => "pt",
+        "nl" => "nl",
+        "ru" => "ru",
+        "pl" => "pl",
+        "uk" => "uk",
+        "cs" => "cs",
+        "sv" => "sv",
+        "no" => "no",
+        "da" => "da",
+        "fi" => "fi",
+        "hu" => "hu",
+        "tr" => "tr",
+        "el" => "el",
+        "zh" => "zh",
+        "ja" => "ja",
+        "ko" => "ko",
+        "ar" => "ar",
+        "he" => "he",
+        "hi" => "hi",
+        "ro" => "ro",
+        "bg" => "bg",
+        "sk" => "sk",
+        "english" => "en",
+        "german" => "de",
+        "spanish" => "es",
+        "french" => "fr",
+        "italian" => "it",
+        "portuguese" => "pt",
+        "dutch" => "nl",
+        "russian" => "ru",
+        "polish" => "pl",
+        "ukrainian" => "uk",
+        "czech" => "cs",
+        "swedish" => "sv",
+        "norwegian" => "no",
+        "danish" => "da",
+        "finnish" => "fi",
+        "hungarian" => "hu",
+        "turkish" => "tr",
+        "greek" => "el",
+        "chinese" => "zh",
+        "japanese" => "ja",
+        "korean" => "ko",
+        "arabic" => "ar",
+        "hebrew" => "he",
+        "hindi" => "hi",
+        "romanian" => "ro",
+        "bulgarian" => "bg",
+        "slovak" => "sk",
+        _ => return None,
+    };
+    Some(code.to_string())
+}
+
+pub fn find_model_file() -> Result<PathBuf> {
+    if let Ok(path) = env::var("WHISPER_MODEL") {
+        let p = PathBuf::from(path);
+        if !p.exists() {
+            return Err(anyhow!(
+                "WHISPER_MODEL points to a non-existing path: {}",
+                p.display()
+            )
+            .into());
+        }
+        if !p.is_file() {
+            return Err(anyhow!(
+                "WHISPER_MODEL must point to a file, but is not: {}",
+                p.display()
+            )
+            .into());
+        }
+        return Ok(p);
+    }
+
+    let models_dir = models_dir_path();
+    if models_dir.exists() && !models_dir.is_dir() {
+        return Err(anyhow!(
+            "Models path exists but is not a directory: {}",
+            models_dir.display()
+        )
+        .into());
+    }
+    std::fs::create_dir_all(&models_dir).with_context(|| {
+        format!(
+            "Failed to ensure models dir exists: {}",
+            models_dir.display()
+        )
+    })?;
+
+    let mut candidates = Vec::new();
+    for entry in std::fs::read_dir(&models_dir)
+        .with_context(|| format!("Failed to read models dir: {}", models_dir.display()))?
+    {
+        let entry = entry?;
+        let path = entry.path();
+
+        let is_bin = path
+            .extension()
+            .and_then(|s| s.to_str())
+            .is_some_and(|s| s.eq_ignore_ascii_case("bin"));
+        if !is_bin {
+            continue;
+        }
+
+        let md = match std::fs::metadata(&path) {
+            Ok(m) if m.is_file() => m,
+            _ => continue,
+        };
+
+        candidates.push((md.len(), path));
+    }
+
+    if candidates.is_empty() {
+        let fallback = models_dir.join("ggml-tiny.en.bin");
+        if fallback.is_file() {
+            return Ok(fallback);
+        }
+        return Err(anyhow!(
+            "No Whisper model files (*.bin) found in {}. \
+             Please download a model or set WHISPER_MODEL.",
+            models_dir.display()
+        )
+        .into());
+    }
+
+    candidates.sort_by_key(|(size, _)| *size);
+    let (_size, path) = candidates.into_iter().last().expect("non-empty");
+    Ok(path)
+}
+
+pub fn decode_audio_to_pcm_f32_ffmpeg(audio_path: &Path) -> Result<Vec<f32>> {
+    let in_path = audio_path
+        .to_str()
+        .ok_or_else(|| anyhow!("Audio path must be valid UTF-8: {}", audio_path.display()))?;
+
+    let tmp_raw = std::env::temp_dir().join("polyscribe_tmp_input.f32le");
+    let tmp_raw_str = tmp_raw
+        .to_str()
+        .ok_or_else(|| anyhow!("Temp path not valid UTF-8: {}", tmp_raw.display()))?;
+
+    let status = Command::new("ffmpeg")
+        .arg("-hide_banner")
+        .arg("-loglevel")
+        .arg("error")
+        .arg("-i")
+        .arg(in_path)
+        .arg("-f")
+        .arg("f32le")
+        .arg("-ac")
+        .arg("1")
+        .arg("-ar")
+        .arg("16000")
+        .arg("-y")
+        .arg(tmp_raw_str)
+        .status()
+        .with_context(|| format!("Failed to invoke ffmpeg to decode: {}", in_path))?;
+
+    if !status.success() {
+        return Err(anyhow!(
+            "ffmpeg exited with non-zero status when decoding {}",
+            in_path
+        )
+        .into());
+    }
+
+    let raw = std::fs::read(&tmp_raw)
+        .with_context(|| format!("Failed to read temp PCM file: {}", tmp_raw.display()))?;
+
+    let _ = std::fs::remove_file(&tmp_raw);
+
+    if raw.len() % 4 != 0 {
+        return Err(anyhow!("Decoded PCM file length not multiple of 4: {}", raw.len()).into());
+    }
+    let mut samples = Vec::with_capacity(raw.len() / 4);
+    for chunk in raw.chunks_exact(4) {
+        let v = f32::from_le_bytes([chunk[0], chunk[1], chunk[2], chunk[3]]);
+        samples.push(v);
+    }
+    Ok(samples)
+}

crates/polyscribe-core/src/model_manager.rs

@@ -0,0 +1,893 @@
+// SPDX-License-Identifier: MIT
+
+use crate::prelude::*;
+use crate::ui::BytesProgress;
+use anyhow::{anyhow, Context};
+use chrono::{DateTime, Utc};
+use reqwest::blocking::Client;
+use reqwest::header::{
+    ACCEPT_RANGES, AUTHORIZATION, CONTENT_LENGTH, ETAG, IF_NONE_MATCH, LAST_MODIFIED, RANGE,
+};
+use serde::{Deserialize, Serialize};
+use sha2::{Digest, Sha256};
+use std::cmp::min;
+use std::collections::BTreeMap;
+use std::fs::{self, File, OpenOptions};
+use std::io::{Read, Seek, SeekFrom, Write};
+use std::path::{Path, PathBuf};
+use std::sync::{mpsc, Arc, Mutex};
+use std::thread;
+use std::time::Duration;
+
+const DEFAULT_CHUNK_SIZE: u64 = 8 * 1024 * 1024; // 8 MiB
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+pub struct ModelRecord {
+    pub alias: String,
+    pub repo: String,
+    pub file: String,
+    pub revision: Option<String>, // ETag or commit hash
+    pub sha256: Option<String>,
+    pub size_bytes: Option<u64>,
+    pub quant: Option<String>,
+    pub installed_at: Option<DateTime<Utc>>,
+    pub last_used: Option<DateTime<Utc>>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+pub struct Manifest {
+    pub models: BTreeMap<String, ModelRecord>, // key = alias
+}
+
+#[derive(Debug, Clone)]
+pub struct Settings {
+    pub concurrency: usize,
+    pub limit_rate: Option<u64>, // bytes/sec
+    pub chunk_size: u64,
+}
+
+impl Default for Settings {
+    fn default() -> Self {
+        Self {
+            concurrency: 4,
+            limit_rate: None,
+            chunk_size: DEFAULT_CHUNK_SIZE,
+        }
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct Paths {
+    pub cache_dir: PathBuf,   // $XDG_CACHE_HOME/polyscribe/models
+    pub config_path: PathBuf, // $XDG_CONFIG_HOME/polyscribe/models.json
+}
+
+impl Paths {
+    pub fn resolve() -> Result<Self> {
+        if let Ok(over) = std::env::var("POLYSCRIBE_CACHE_DIR") {
+            if !over.is_empty() {
+                let cache_dir = PathBuf::from(over).join("models");
+                let config_path = std::env::var("POLYSCRIBE_CONFIG_DIR")
+                    .map(|p| PathBuf::from(p).join("models.json"))
+                    .unwrap_or_else(|_| default_config_path());
+                return Ok(Self {
+                    cache_dir,
+                    config_path,
+                });
+            }
+        }
+        let cache_dir = default_cache_dir();
+        let config_path = default_config_path();
+        Ok(Self {
+            cache_dir,
+            config_path,
+        })
+    }
+}
+
+fn default_cache_dir() -> PathBuf {
+    if let Ok(xdg) = std::env::var("XDG_CACHE_HOME") {
+        if !xdg.is_empty() {
+            return PathBuf::from(xdg).join("polyscribe").join("models");
+        }
+    }
+    if let Ok(home) = std::env::var("HOME") {
+        if !home.is_empty() {
+            return PathBuf::from(home)
+                .join(".cache")
+                .join("polyscribe")
+                .join("models");
+        }
+    }
+    PathBuf::from("models")
+}
+
+fn default_config_path() -> PathBuf {
+    if let Ok(xdg) = std::env::var("XDG_CONFIG_HOME") {
+        if !xdg.is_empty() {
+            return PathBuf::from(xdg).join("polyscribe").join("models.json");
+        }
+    }
+    if let Ok(home) = std::env::var("HOME") {
+        if !home.is_empty() {
+            return PathBuf::from(home)
+                .join(".config")
+                .join("polyscribe")
+                .join("models.json");
+        }
+    }
+    PathBuf::from("models.json")
+}
+
+pub trait HttpClient: Send + Sync {
+    fn head(&self, url: &str, etag: Option<&str>) -> Result<HeadMeta>;
+    fn get_range(&self, url: &str, start: u64, end_inclusive: u64) -> Result<Vec<u8>>;
+    fn get_whole_to(&self, url: &str, writer: &mut dyn Write) -> Result<()>;
+    fn get_from_to(&self, url: &str, start: u64, writer: &mut dyn Write) -> Result<()>;
+}
+
+#[derive(Debug, Clone)]
+pub struct ReqwestClient {
+    client: Client,
+    token: Option<String>,
+}
+
+impl ReqwestClient {
+    pub fn new() -> Result<Self> {
+        let token = std::env::var("HF_TOKEN").ok().filter(|s| !s.is_empty());
+        let client = Client::builder()
+            .user_agent(crate::config::ConfigService::user_agent())
+            .build()?;
+        Ok(Self { client, token })
+    }
+
+    fn auth(&self, mut req: reqwest::blocking::RequestBuilder) -> reqwest::blocking::RequestBuilder {
+        if let Some(t) = &self.token {
+            req = req.header(AUTHORIZATION, format!("Bearer {}", t));
+        }
+        req
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct HeadMeta {
+    pub len: Option<u64>,
+    pub etag: Option<String>,
+    pub last_modified: Option<String>,
+    pub accept_ranges: bool,
+    pub not_modified: bool,
+    pub status: u16,
+}
+
+impl HttpClient for ReqwestClient {
+    fn head(&self, url: &str, etag: Option<&str>) -> Result<HeadMeta> {
+        let mut req = self.client.head(url);
+        if let Some(e) = etag {
+            req = req.header(IF_NONE_MATCH, format!("\"{}\"", e));
+        }
+        let resp = self.auth(req).send()?;
+        let status = resp.status().as_u16();
+        if status == 304 {
+            return Ok(HeadMeta {
+                len: None,
+                etag: etag.map(|s| s.to_string()),
+                last_modified: None,
+                accept_ranges: true,
+                not_modified: true,
+                status,
+            });
+        }
+        let len = resp
+            .headers()
+            .get(CONTENT_LENGTH)
+            .and_then(|v| v.to_str().ok())
+            .and_then(|s| s.parse::<u64>().ok());
+        let etag = resp
+            .headers()
+            .get(ETAG)
+            .and_then(|v| v.to_str().ok())
+            .map(|s| s.trim_matches('"').to_string());
+        let last_modified = resp
+            .headers()
+            .get(LAST_MODIFIED)
+            .and_then(|v| v.to_str().ok())
+            .map(|s| s.to_string());
+        let accept_ranges = resp
+            .headers()
+            .get(ACCEPT_RANGES)
+            .and_then(|v| v.to_str().ok())
+            .map(|s| s.to_ascii_lowercase().contains("bytes"))
+            .unwrap_or(false);
+        Ok(HeadMeta {
+            len,
+            etag,
+            last_modified,
+            accept_ranges,
+            not_modified: false,
+            status,
+        })
+    }
+
+    fn get_range(&self, url: &str, start: u64, end_inclusive: u64) -> Result<Vec<u8>> {
+        let range_val = format!("bytes={}-{}", start, end_inclusive);
+        let resp = self
+            .auth(self.client.get(url))
+            .header(RANGE, range_val)
+            .send()?;
+        if !resp.status().is_success() && resp.status().as_u16() != 206 {
+            return Err(anyhow!("HTTP {} for ranged GET", resp.status()).into());
+        }
+        let mut buf = Vec::new();
+        let mut r = resp;
+        r.copy_to(&mut buf)?;
+        Ok(buf)
+    }
+
+    fn get_whole_to(&self, url: &str, writer: &mut dyn Write) -> Result<()> {
+        let resp = self.auth(self.client.get(url)).send()?;
+        if !resp.status().is_success() {
+            return Err(anyhow!("HTTP {} for GET", resp.status()).into());
+        }
+        let mut r = resp;
+        r.copy_to(writer)?;
+        Ok(())
+    }
+
+    fn get_from_to(&self, url: &str, start: u64, writer: &mut dyn Write) -> Result<()> {
+        let mut req = self.auth(self.client.get(url));
+        if start > 0 {
+            req = req.header(RANGE, format!("bytes={}-", start));
+        }
+        let resp = req.send()?;
+        if !resp.status().is_success() && resp.status().as_u16() != 206 {
+            return Err(anyhow!("HTTP {} for ranged GET from {}", resp.status(), start).into());
+        }
+        let mut r = resp;
+        r.copy_to(writer)?;
+        Ok(())
+    }
+}
+
+pub struct ModelManager<C: HttpClient = ReqwestClient> {
+    pub paths: Paths,
+    pub settings: Settings,
+    client: Arc<C>,
+}
+
+impl<C: HttpClient + 'static> ModelManager<C> {
+    pub fn new_with_client(client: C, settings: Settings) -> Result<Self> {
+        Ok(Self {
+            paths: Paths::resolve()?,
+            settings,
+            client: Arc::new(client),
+        })
+    }
+
+    pub fn new(settings: Settings) -> Result<Self>
+    where
+        C: Default,
+    {
+        Ok(Self {
+            paths: Paths::resolve()?,
+            settings,
+            client: Arc::new(C::default()),
+        })
+    }
+
+    fn load_manifest(&self) -> Result<Manifest> {
+        let p = &self.paths.config_path;
+        if !p.exists() {
+            return Ok(Manifest::default());
+        }
+        let file = File::open(p).with_context(|| format!("open manifest {}", p.display()))?;
+        let m: Manifest = serde_json::from_reader(file).context("parse manifest")?;
+        Ok(m)
+    }
+
+    fn save_manifest(&self, m: &Manifest) -> Result<()> {
+        let p = &self.paths.config_path;
+        if let Some(dir) = p.parent() {
+            fs::create_dir_all(dir)
+                .with_context(|| format!("create config dir {}", dir.display()))?;
+        }
+        let tmp = p.with_extension("json.tmp");
+        let f = OpenOptions::new()
+            .create(true)
+            .write(true)
+            .truncate(true)
+            .open(&tmp)?;
+        serde_json::to_writer_pretty(f, m).context("serialize manifest")?;
+        fs::rename(&tmp, p).with_context(|| format!("atomic rename {} -> {}", tmp.display(), p.display()))?;
+        Ok(())
+    }
+
+    fn model_path(&self, file: &str) -> PathBuf {
+        self.paths.cache_dir.join(file)
+    }
+
+    fn compute_sha256(path: &Path) -> Result<String> {
+        let mut f = File::open(path)?;
+        let mut hasher = Sha256::new();
+        let mut buf = [0u8; 64 * 1024];
+        loop {
+            let n = f.read(&mut buf)?;
+            if n == 0 {
+                break;
+            }
+            hasher.update(&buf[..n]);
+        }
+        Ok(format!("{:x}", hasher.finalize()))
+    }
+
+    pub fn ls(&self) -> Result<Vec<ModelRecord>> {
+        let m = self.load_manifest()?;
+        Ok(m.models.values().cloned().collect())
+    }
+
+    pub fn rm(&self, alias: &str) -> Result<bool> {
+        let mut m = self.load_manifest()?;
+        if let Some(rec) = m.models.remove(alias) {
+            let p = self.model_path(&rec.file);
+            let _ = fs::remove_file(&p);
+            self.save_manifest(&m)?;
+            return Ok(true);
+        }
+        Ok(false)
+    }
+
+    pub fn verify(&self, alias: &str) -> Result<bool> {
+        let m = self.load_manifest()?;
+        let Some(rec) = m.models.get(alias) else { return Ok(false) };
+        let p = self.model_path(&rec.file);
+        if !p.exists() { return Ok(false); }
+        if let Some(expected) = &rec.sha256 {
+            let actual = Self::compute_sha256(&p)?;
+            return Ok(&actual == expected);
+        }
+        Ok(true)
+    }
+
+    pub fn gc(&self) -> Result<(usize, usize)> {
+        // Remove files not referenced by manifest; also drop manifest entries whose file is missing
+        fs::create_dir_all(&self.paths.cache_dir).ok();
+        let mut m = self.load_manifest()?;
+        let mut referenced = BTreeMap::new();
+        for (alias, rec) in &m.models {
+            referenced.insert(rec.file.clone(), alias.clone());
+        }
+        let mut removed_files = 0usize;
+        if let Ok(rd) = fs::read_dir(&self.paths.cache_dir) {
+            for ent in rd.flatten() {
+                let p = ent.path();
+                if p.is_file() {
+                    let fname = p.file_name().and_then(|s| s.to_str()).unwrap_or("");
+                    if !referenced.contains_key(fname) {
+                        let _ = fs::remove_file(&p);
+                        removed_files += 1;
+                    }
+                }
+            }
+        }
+
+        m.models.retain(|_, rec| self.model_path(&rec.file).exists());
+        let removed_entries = referenced
+            .keys()
+            .filter(|f| !self.model_path(f).exists())
+            .count();
+
+        self.save_manifest(&m)?;
+        Ok((removed_files, removed_entries))
+    }
+
+    pub fn add_or_update(
+        &self,
+        alias: &str,
+        repo: &str,
+        file: &str,
+    ) -> Result<ModelRecord> {
+        fs::create_dir_all(&self.paths.cache_dir)
+            .with_context(|| format!("create cache dir {}", self.paths.cache_dir.display()))?;
+
+        let url = format!("https://huggingface.co/{}/resolve/main/{}?download=true", repo, file);
+
+        let mut manifest = self.load_manifest()?;
+        let prev = manifest.models.get(alias).cloned();
+        let prev_etag = prev.as_ref().and_then(|r| r.revision.clone());
+        // Fetch remote meta (size/hash) when available to verify the download
+        let (_api_size, api_sha) = hf_fetch_file_meta(repo, file).unwrap_or((None, None));
+        let head = self.client.head(&url, prev_etag.as_deref())?;
+        if head.not_modified {
+            // up-to-date; ensure record present and touch last_used
+            let mut rec = prev.ok_or_else(|| anyhow!("not installed yet but server says 304"))?;
+            rec.last_used = Some(Utc::now());
+            self.save_touch(&mut manifest, rec.clone())?;
+            return Ok(rec);
+        }
+
+        // Quick check: if HEAD failed (e.g., 404), report a helpful error before attempting download
+        if head.status >= 400 {
+            return Err(anyhow!(
+                "file not found or inaccessible: repo='{}' file='{}' (HTTP {})\nHint: run `polyscribe models search {} --query {}` to list available files",
+                repo,
+                file,
+                head.status,
+                repo,
+                file
+            ).into());
+        }
+
+        let total_len = head.len.ok_or_else(|| anyhow!("missing content-length (HEAD)"))?;
+        let etag = head.etag.clone();
+        let dest_tmp = self.model_path(&format!("{}.part", file));
+        // If a previous cancelled download left a .part file, remove it to avoid clutter/resume.
+        if dest_tmp.exists() { let _ = fs::remove_file(&dest_tmp); }
+        // Guard to ensure .part is cleaned up on errors
+        struct TempGuard { path: PathBuf, armed: bool }
+        impl TempGuard { fn disarm(&mut self) { self.armed = false; } }
+        impl Drop for TempGuard {
+            fn drop(&mut self) {
+                if self.armed {
+                    let _ = fs::remove_file(&self.path);
+                }
+            }
+        }
+        let mut _tmp_guard = TempGuard { path: dest_tmp.clone(), armed: true };
+        let dest_final = self.model_path(file);
+
+        // Do not resume after cancellation; start fresh to avoid stale .part files
+        let start_from = 0u64;
+
+        // Open tmp for write
+        let f = OpenOptions::new().create(true).write(true).read(true).open(&dest_tmp)?;
+        f.set_len(total_len)?; // pre-allocate for random writes
+        let f = Arc::new(Mutex::new(f));
+
+        // Create progress bar
+        let mut progress = BytesProgress::start(total_len, &format!("Downloading {}", file), start_from);
+
+        // Create work chunks
+        let chunk_size = self.settings.chunk_size;
+        let mut chunks = Vec::new();
+        let mut pos = start_from;
+        while pos < total_len {
+            let end = min(total_len - 1, pos + chunk_size - 1);
+            chunks.push((pos, end));
+            pos = end + 1;
+        }
+
+        // Attempt concurrent ranged download; on failure, fallback to streaming GET
+        let mut ranged_failed = false;
+        if head.accept_ranges && self.settings.concurrency > 1 {
+            let (work_tx, work_rx) = mpsc::channel::<(u64, u64)>();
+            let (prog_tx, prog_rx) = mpsc::channel::<u64>();
+            for ch in chunks {
+                work_tx.send(ch).unwrap();
+            }
+            drop(work_tx);
+            let rx = Arc::new(Mutex::new(work_rx));
+
+            let workers = self.settings.concurrency.max(1);
+            let mut handles = Vec::new();
+            for _ in 0..workers {
+                let rx = rx.clone();
+                let url = url.clone();
+                let client = self.client.clone();
+                let f = f.clone();
+                let limit = self.settings.limit_rate;
+                let prog_tx = prog_tx.clone();
+                let handle = thread::spawn(move || -> Result<()> {
+                    loop {
+                        let next = {
+                            let guard = rx.lock().unwrap();
+                            guard.recv().ok()
+                        };
+                        let Some((start, end)) = next else { break; };
+                        let data = client.get_range(&url, start, end)?;
+                        if let Some(max_bps) = limit {
+                            let dur = Duration::from_secs_f64((data.len() as f64) / (max_bps as f64));
+                            if dur > Duration::from_millis(1) {
+                                thread::sleep(dur);
+                            }
+                        }
+                        let mut guard = f.lock().unwrap();
+                        guard.seek(SeekFrom::Start(start))?;
+                        guard.write_all(&data)?;
+                        let _ = prog_tx.send(data.len() as u64);
+                    }
+                    Ok(())
+                });
+                handles.push(handle);
+            }
+            drop(prog_tx);
+
+            for delta in prog_rx {
+                progress.inc(delta);
+            }
+
+            let mut ranged_err: Option<anyhow::Error> = None;
+            for h in handles {
+                match h.join() {
+                    Ok(Ok(())) => {}
+                    Ok(Err(e)) => { ranged_failed = true; if ranged_err.is_none() { ranged_err = Some(e.into()); } }
+                    Err(_) => { ranged_failed = true; if ranged_err.is_none() { ranged_err = Some(anyhow!("worker panicked")); } }
+                }
+            }
+        } else {
+            ranged_failed = true;
+        }
+
+        if ranged_failed {
+            // Restart progress if we are abandoning previous partial state
+            if start_from > 0 {
+                progress.stop("retrying as streaming");
+                progress = BytesProgress::start(total_len, &format!("Downloading {}", file), 0);
+            }
+            // Fallback to streaming GET; try URL with and without ?download=true
+            let mut try_urls = vec![url.clone()];
+            if let Some((base, _qs)) = url.split_once('?') {
+                try_urls.push(base.to_string());
+            } else {
+                try_urls.push(format!("{}?download=true", url));
+            }
+            // Fresh temp file for streaming
+            let mut wf = OpenOptions::new().create(true).write(true).truncate(true).open(&dest_tmp)?;
+            let mut ok = false;
+            let mut last_err: Option<anyhow::Error> = None;
+            // Counting writer to update progress inline
+            struct CountingWriter<'a, 'b> {
+                inner: &'a mut File,
+                progress: &'b mut BytesProgress,
+            }
+            impl<'a, 'b> Write for CountingWriter<'a, 'b> {
+                fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
+                    let n = self.inner.write(buf)?;
+                    self.progress.inc(n as u64);
+                    Ok(n)
+                }
+                fn flush(&mut self) -> std::io::Result<()> { self.inner.flush() }
+            }
+            let mut cw = CountingWriter { inner: &mut wf, progress: &mut progress };
+            for u in try_urls {
+                // For fallback, stream from scratch to ensure integrity
+                let res = self.client.get_whole_to(&u, &mut cw);
+                match res {
+                    Ok(()) => { ok = true; break; }
+                    Err(e) => { last_err = Some(e.into()); }
+                }
+            }
+            if !ok {
+                if let Some(e) = last_err { return Err(e.into()); }
+                return Err(anyhow!("download failed (ranged and streaming)").into());
+            }
+        }
+
+        progress.stop("download complete");
+
+        // Verify integrity
+        let sha = Self::compute_sha256(&dest_tmp)?;
+        if let Some(expected) = api_sha.as_ref() {
+            if &sha != expected {
+                return Err(anyhow!(
+                    "sha256 mismatch (expected {}, got {})",
+                    expected,
+                    sha
+                ).into());
+            }
+        } else if prev.as_ref().map(|r| r.file.eq(file)).unwrap_or(false) {
+            if let Some(expected) = prev.as_ref().and_then(|r| r.sha256.as_ref()) {
+                if &sha != expected {
+                    return Err(anyhow!("sha256 mismatch").into());
+                }
+            }
+        }
+        // Atomic rename
+        fs::rename(&dest_tmp, &dest_final).with_context(|| format!("rename {} -> {}", dest_tmp.display(), dest_final.display()))?;
+        // Disarm guard; .part has been moved or cleaned
+        _tmp_guard.disarm();
+
+        let rec = ModelRecord {
+            alias: alias.to_string(),
+            repo: repo.to_string(),
+            file: file.to_string(),
+            revision: etag,
+            sha256: Some(sha.clone()),
+            size_bytes: Some(total_len),
+            quant: infer_quant(file),
+            installed_at: Some(Utc::now()),
+            last_used: Some(Utc::now()),
+        };
+        self.save_touch(&mut manifest, rec.clone())?;
+        Ok(rec)
+    }
+
+    fn save_touch(&self, manifest: &mut Manifest, rec: ModelRecord) -> Result<()> {
+        manifest.models.insert(rec.alias.clone(), rec);
+        self.save_manifest(manifest)
+    }
+}
+
+fn infer_quant(file: &str) -> Option<String> {
+    // Try to extract a Q* token, e.g. Q5_K_M from filename
+    let lower = file.to_ascii_uppercase();
+    if let Some(pos) = lower.find('Q') {
+        let tail = &lower[pos..];
+        let token: String = tail
+            .chars()
+            .take_while(|c| c.is_ascii_uppercase() || c.is_ascii_digit() || *c == '_' || *c == '-')
+            .collect();
+        if token.len() >= 2 {
+            return Some(token);
+        }
+    }
+    None
+}
+
+impl Default for ReqwestClient {
+    fn default() -> Self {
+        Self::new().expect("reqwest client")
+    }
+}
+
+// Hugging Face API types for file metadata
+#[derive(Debug, Deserialize)]
+struct ApiHfLfs {
+    oid: Option<String>,
+    size: Option<u64>,
+    sha256: Option<String>,
+}
+
+#[derive(Debug, Deserialize)]
+struct ApiHfFile {
+    rfilename: String,
+    size: Option<u64>,
+    sha256: Option<String>,
+    lfs: Option<ApiHfLfs>,
+}
+
+#[derive(Debug, Deserialize)]
+struct ApiHfModelInfo {
+    siblings: Option<Vec<ApiHfFile>>,
+    files: Option<Vec<ApiHfFile>>,
+}
+
+fn pick_sha_from_file(f: &ApiHfFile) -> Option<String> {
+    if let Some(s) = &f.sha256 { return Some(s.to_string()); }
+    if let Some(l) = &f.lfs {
+        if let Some(s) = &l.sha256 { return Some(s.to_string()); }
+        if let Some(oid) = &l.oid { return oid.strip_prefix("sha256:").map(|s| s.to_string()); }
+    }
+    None
+}
+
+fn hf_fetch_file_meta(repo: &str, target: &str) -> Result<(Option<u64>, Option<String>)> {
+    let token = std::env::var("HF_TOKEN").ok().filter(|s| !s.is_empty());
+    let client = Client::builder()
+        .user_agent(crate::config::ConfigService::user_agent())
+        .build()?;
+    let base = crate::config::ConfigService::hf_api_base_for(repo);
+    let urls = [base.clone(), format!("{}?expand=files", base)];
+    for url in urls {
+        let mut req = client.get(&url);
+        if let Some(t) = &token { req = req.header(AUTHORIZATION, format!("Bearer {}", t)); }
+        let resp = req.send()?;
+        if !resp.status().is_success() { continue; }
+        let info: ApiHfModelInfo = resp.json()?;
+        let list = info.files.or(info.siblings).unwrap_or_default();
+        for f in list {
+            let name = f.rfilename.rsplit('/').next().unwrap_or(&f.rfilename);
+            if name.eq_ignore_ascii_case(target) {
+                let sz = f.size.or_else(|| f.lfs.as_ref().and_then(|l| l.size));
+                let sha = pick_sha_from_file(&f);
+                return Ok((sz, sha));
+            }
+        }
+    }
+    Err(anyhow!("file not found in HF API").into())
+}
+
+/// Fetch remote metadata (size, sha256) for a single file in a HF repo.
+pub fn fetch_file_meta(repo: &str, file: &str) -> Result<(Option<u64>, Option<String>)> {
+    hf_fetch_file_meta(repo, file)
+}
+
+/// Search a Hugging Face repo for GGUF/BIN files via API. Returns file names only.
+pub fn search_repo(repo: &str, query: Option<&str>) -> Result<Vec<String>> {
+    let token = std::env::var("HF_TOKEN").ok().filter(|s| !s.is_empty());
+    let client = Client::builder()
+        .user_agent(crate::config::ConfigService::user_agent())
+        .build()?;
+
+    let base = crate::config::ConfigService::hf_api_base_for(repo);
+    let mut urls = vec![base.clone(), format!("{}?expand=files", base)];
+    let mut files = Vec::<String>::new();
+
+    for url in urls.drain(..) {
+        let mut req = client.get(&url);
+        if let Some(t) = &token { req = req.header(AUTHORIZATION, format!("Bearer {}", t)); }
+        let resp = req.send()?;
+        if !resp.status().is_success() { continue; }
+        let info: ApiHfModelInfo = resp.json()?;
+        let list = info.files.or(info.siblings).unwrap_or_default();
+        for f in list {
+            if f.rfilename.ends_with(".gguf") || f.rfilename.ends_with(".bin") {
+                let name = f.rfilename.rsplit('/').next().unwrap_or(&f.rfilename).to_string();
+                if !files.contains(&name) { files.push(name); }
+            }
+        }
+        if !files.is_empty() { break; }
+    }
+
+    if let Some(q) = query { let qlc = q.to_ascii_lowercase(); files.retain(|f| f.to_ascii_lowercase().contains(&qlc)); }
+    files.sort();
+    Ok(files)
+}
+
+/// List repo files with optional size metadata for GGUF/BIN entries.
+pub fn list_repo_files_with_meta(repo: &str) -> Result<Vec<(String, Option<u64>)>> {
+    let token = std::env::var("HF_TOKEN").ok().filter(|s| !s.is_empty());
+    let client = Client::builder()
+        .user_agent(crate::config::ConfigService::user_agent())
+        .build()?;
+
+    let base = crate::config::ConfigService::hf_api_base_for(repo);
+    for url in [base.clone(), format!("{}?expand=files", base)] {
+        let mut req = client.get(&url);
+        if let Some(t) = &token { req = req.header(AUTHORIZATION, format!("Bearer {}", t)); }
+        let resp = req.send()?;
+        if !resp.status().is_success() { continue; }
+        let info: ApiHfModelInfo = resp.json()?;
+        let list = info.files.or(info.siblings).unwrap_or_default();
+        let mut out = Vec::new();
+        for f in list {
+            if !(f.rfilename.ends_with(".gguf") || f.rfilename.ends_with(".bin")) { continue; }
+            let name = f.rfilename.rsplit('/').next().unwrap_or(&f.rfilename).to_string();
+            let size = f.size.or_else(|| f.lfs.as_ref().and_then(|l| l.size));
+            out.push((name, size));
+        }
+        if !out.is_empty() { return Ok(out); }
+    }
+    Ok(Vec::new())
+}
+
+/// Fallback: HEAD request for a single file to retrieve Content-Length (size).
+pub fn head_len_for_file(repo: &str, file: &str) -> Option<u64> {
+    let token = std::env::var("HF_TOKEN").ok().filter(|s| !s.is_empty());
+    let client = Client::builder()
+        .user_agent(crate::config::ConfigService::user_agent())
+        .build().ok()?;
+    let mut urls = Vec::new();
+    urls.push(format!("https://huggingface.co/{}/resolve/main/{}?download=true", repo, file));
+    urls.push(format!("https://huggingface.co/{}/resolve/main/{}", repo, file));
+    for url in urls {
+        let mut req = client.head(&url);
+        if let Some(t) = &token { req = req.header(AUTHORIZATION, format!("Bearer {}", t)); }
+        if let Ok(resp) = req.send() {
+            if resp.status().is_success() {
+                if let Some(len) = resp.headers().get(CONTENT_LENGTH)
+                    .and_then(|v| v.to_str().ok())
+                    .and_then(|s| s.parse::<u64>().ok())
+                { return Some(len); }
+            }
+        }
+    }
+    None
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::env;
+    use tempfile::TempDir;
+
+    #[derive(Clone)]
+    struct StubHttp {
+        data: Arc<Vec<u8>>,
+        etag: Arc<Option<String>>,
+        accept_ranges: bool,
+    }
+    impl HttpClient for StubHttp {
+        fn head(&self, _url: &str, etag: Option<&str>) -> Result<HeadMeta> {
+            let not_modified = etag.is_some() && self.etag.as_ref().as_deref() == etag;
+            Ok(HeadMeta {
+                len: Some(self.data.len() as u64),
+                etag: self.etag.as_ref().clone(),
+                last_modified: None,
+                accept_ranges: self.accept_ranges,
+                not_modified,
+                status: if not_modified { 304 } else { 200 },
+            })
+        }
+        fn get_range(&self, _url: &str, start: u64, end_inclusive: u64) -> Result<Vec<u8>> {
+            let s = start as usize;
+            let e = (end_inclusive as usize) + 1;
+            Ok(self.data[s..e].to_vec())
+        }
+
+        fn get_whole_to(&self, _url: &str, writer: &mut dyn Write) -> Result<()> {
+            writer.write_all(&self.data)?;
+            Ok(())
+        }
+
+        fn get_from_to(&self, _url: &str, start: u64, writer: &mut dyn Write) -> Result<()> {
+            let s = start as usize;
+            writer.write_all(&self.data[s..])?;
+            Ok(())
+        }
+    }
+
+    fn setup_env(cache: &Path, cfg: &Path) {
+        unsafe {
+            env::set_var("POLYSCRIBE_CACHE_DIR", cache.to_string_lossy().to_string());
+            env::set_var(
+                "POLYSCRIBE_CONFIG_DIR",
+                cfg.parent().unwrap().to_string_lossy().to_string(),
+            );
+        }
+    }
+
+    #[test]
+    fn test_manifest_roundtrip() {
+        let temp = TempDir::new().unwrap();
+        let cache = temp.path().join("cache");
+        let cfg = temp.path().join("config").join("models.json");
+        setup_env(&cache, &cfg);
+
+        let client = StubHttp {
+            data: Arc::new(vec![0u8; 1024]),
+            etag: Arc::new(Some("etag123".into())),
+            accept_ranges: true,
+        };
+        let mm: ModelManager<StubHttp> = ModelManager::new_with_client(client, Settings::default()).unwrap();
+        let m = mm.load_manifest().unwrap();
+        assert!(m.models.is_empty());
+
+        let rec = ModelRecord {
+            alias: "tiny".into(),
+            repo: "foo/bar".into(),
+            file: "gguf-tiny.bin".into(),
+            revision: Some("etag123".into()),
+            sha256: None,
+            size_bytes: None,
+            quant: None,
+            installed_at: None,
+            last_used: None,
+        };
+
+        let mut m2 = Manifest::default();
+        mm.save_touch(&mut m2, rec.clone()).unwrap();
+        let m3 = mm.load_manifest().unwrap();
+        assert!(m3.models.contains_key("tiny"));
+    }
+
+    #[test]
+    fn test_add_verify_update_gc() {
+        let temp = TempDir::new().unwrap();
+        let cache = temp.path().join("cache");
+        let cfg_dir = temp.path().join("config");
+        let cfg = cfg_dir.join("models.json");
+        setup_env(&cache, &cfg);
+
+        let data = (0..1024 * 1024u32).flat_map(|i| i.to_le_bytes()).collect::<Vec<u8>>();
+        let etag = Some("abc123".to_string());
+        let client = StubHttp { data: Arc::new(data), etag: Arc::new(etag), accept_ranges: true };
+        let mm: ModelManager<StubHttp> = ModelManager::new_with_client(client.clone(), Settings{ concurrency: 3, ..Default::default() }).unwrap();
+
+        // add
+        let rec = mm.add_or_update("tiny", "gguf/models", "gguf-tiny-q4_0.bin").unwrap();
+        assert_eq!(rec.alias, "tiny");
+        assert!(mm.verify("tiny").unwrap());
+
+        // update (304)
+        let rec2 = mm.add_or_update("tiny", "gguf/models", "gguf-tiny-q4_0.bin").unwrap();
+        assert_eq!(rec2.alias, "tiny");
+
+        // gc (nothing to remove)
+        let (files_removed, entries_removed) = mm.gc().unwrap();
+        assert_eq!(files_removed, 0);
+        assert_eq!(entries_removed, 0);
+
+        // rm
+        assert!(mm.rm("tiny").unwrap());
+        assert!(!mm.rm("tiny").unwrap());
+    }
+}

crates/polyscribe-core/src/prelude.rs

@@ -0,0 +1,7 @@
+pub use crate::backend::*;
+pub use crate::config::*;
+pub use crate::error::Error;
+pub use crate::models::*;
+pub use crate::ui::*;
+
+pub type Result<T, E = Error> = std::result::Result<T, E>;

crates/polyscribe-core/src/ui.rs

@@ -0,0 +1,329 @@
+// SPDX-License-Identifier: MIT
+
+pub mod progress;
+
+use std::io;
+use std::io::IsTerminal;
+use std::io::Write as _;
+use std::time::{Duration, Instant};
+
+pub fn info(msg: impl AsRef<str>) {
+    let m = msg.as_ref();
+    let _ = cliclack::log::info(m);
+}
+
+pub fn warn(msg: impl AsRef<str>) {
+    let m = msg.as_ref();
+    let _ = cliclack::log::warning(m);
+}
+
+pub fn error(msg: impl AsRef<str>) {
+    let m = msg.as_ref();
+    let _ = cliclack::log::error(m);
+}
+
+pub fn success(msg: impl AsRef<str>) {
+    let m = msg.as_ref();
+    let _ = cliclack::log::success(m);
+}
+
+pub fn note(prompt: impl AsRef<str>, message: impl AsRef<str>) {
+    let _ = cliclack::note(prompt.as_ref(), message.as_ref());
+}
+
+pub fn intro(title: impl AsRef<str>) {
+    let _ = cliclack::intro(title.as_ref());
+}
+
+pub fn outro(msg: impl AsRef<str>) {
+    let _ = cliclack::outro(msg.as_ref());
+}
+
+pub fn println_above_bars(line: impl AsRef<str>) {
+    let _ = cliclack::log::info(line.as_ref());
+}
+
+pub fn prompt_input(prompt: &str, default: Option<&str>) -> io::Result<String> {
+    if crate::is_no_interaction() || !crate::stdin_is_tty() {
+        return Ok(default.unwrap_or("").to_string());
+    }
+    let mut q = cliclack::input(prompt);
+    if let Some(def) = default {
+        q = q.default_input(def);
+    }
+    q.interact().map_err(|e| io::Error::other(e.to_string()))
+}
+
+pub fn prompt_select(prompt: &str, items: &[&str]) -> io::Result<usize> {
+    if crate::is_no_interaction() || !crate::stdin_is_tty() {
+        return Err(io::Error::other("interactive prompt disabled"));
+    }
+    let mut sel = cliclack::select::<usize>(prompt);
+    for (idx, label) in items.iter().enumerate() {
+        sel = sel.item(idx, *label, "");
+    }
+    sel.interact().map_err(|e| io::Error::other(e.to_string()))
+}
+
+pub fn prompt_multi_select(
+    prompt: &str,
+    items: &[&str],
+    defaults: Option<&[bool]>,
+) -> io::Result<Vec<usize>> {
+    if crate::is_no_interaction() || !crate::stdin_is_tty() {
+        return Err(io::Error::other("interactive prompt disabled"));
+    }
+    let mut ms = cliclack::multiselect::<usize>(prompt);
+    for (idx, label) in items.iter().enumerate() {
+        ms = ms.item(idx, *label, "");
+    }
+    if let Some(def) = defaults {
+        let selected: Vec<usize> = def
+            .iter()
+            .enumerate()
+            .filter_map(|(i, &on)| if on { Some(i) } else { None })
+            .collect();
+        if !selected.is_empty() {
+            ms = ms.initial_values(selected);
+        }
+    }
+    ms.interact().map_err(|e| io::Error::other(e.to_string()))
+}
+
+pub fn prompt_confirm(prompt: &str, default: bool) -> io::Result<bool> {
+    if crate::is_no_interaction() || !crate::stdin_is_tty() {
+        return Ok(default);
+    }
+    let mut q = cliclack::confirm(prompt);
+    q.interact().map_err(|e| io::Error::other(e.to_string()))
+}
+
+pub fn prompt_password(prompt: &str) -> io::Result<String> {
+    if crate::is_no_interaction() || !crate::stdin_is_tty() {
+        return Err(io::Error::other(
+            "password prompt disabled in non-interactive mode",
+        ));
+    }
+    let mut q = cliclack::password(prompt);
+    q.interact().map_err(|e| io::Error::other(e.to_string()))
+}
+
+pub fn prompt_input_validated<F>(
+    prompt: &str,
+    default: Option<&str>,
+    validate: F,
+) -> io::Result<String>
+where
+    F: Fn(&str) -> Result<(), String> + 'static,
+{
+    if crate::is_no_interaction() || !crate::stdin_is_tty() {
+        if let Some(def) = default {
+            return Ok(def.to_string());
+        }
+        return Err(io::Error::other("interactive prompt disabled"));
+    }
+    let mut q = cliclack::input(prompt);
+    if let Some(def) = default {
+        q = q.default_input(def);
+    }
+    q.validate(move |s: &String| validate(s))
+        .interact()
+        .map_err(|e| io::Error::other(e.to_string()))
+}
+
+pub struct Spinner(cliclack::ProgressBar);
+
+impl Spinner {
+    pub fn start(text: impl AsRef<str>) -> Self {
+        if crate::is_no_progress() || crate::is_no_interaction() || !std::io::stderr().is_terminal()
+        {
+            let _ = cliclack::log::info(text.as_ref());
+            let s = cliclack::spinner();
+            Self(s)
+        } else {
+            let s = cliclack::spinner();
+            s.start(text.as_ref());
+            Self(s)
+        }
+    }
+    pub fn stop(self, text: impl AsRef<str>) {
+        let s = self.0;
+        if crate::is_no_progress() {
+            let _ = cliclack::log::info(text.as_ref());
+        } else {
+            s.stop(text.as_ref());
+        }
+    }
+    pub fn success(self, text: impl AsRef<str>) {
+        let s = self.0;
+        if crate::is_no_progress() {
+            let _ = cliclack::log::success(text.as_ref());
+        } else {
+            s.stop(text.as_ref());
+        }
+    }
+    pub fn error(self, text: impl AsRef<str>) {
+        let s = self.0;
+        if crate::is_no_progress() {
+            let _ = cliclack::log::error(text.as_ref());
+        } else {
+            s.error(text.as_ref());
+        }
+    }
+}
+
+pub struct BytesProgress {
+    enabled: bool,
+    total: u64,
+    current: u64,
+    started: Instant,
+    last_msg: Instant,
+    width: usize,
+    // Sticky ETA to carry through zero-speed stalls
+    last_eta_secs: Option<f64>,
+}
+
+impl BytesProgress {
+    pub fn start(total: u64, text: &str, initial: u64) -> Self {
+        let enabled = !(crate::is_no_progress()
+            || crate::is_no_interaction()
+            || !std::io::stderr().is_terminal()
+            || total == 0);
+        if !enabled {
+            let _ = cliclack::log::info(text);
+        }
+        let mut me = Self {
+            enabled,
+            total,
+            current: initial.min(total),
+            started: Instant::now(),
+            last_msg: Instant::now(),
+            width: 40,
+            last_eta_secs: None,
+        };
+        me.draw();
+        me
+    }
+
+    fn human_bytes(n: u64) -> String {
+        const KB: f64 = 1024.0;
+        const MB: f64 = 1024.0 * KB;
+        const GB: f64 = 1024.0 * MB;
+        let x = n as f64;
+        if x >= GB {
+            format!("{:.2} GiB", x / GB)
+        } else if x >= MB {
+            format!("{:.2} MiB", x / MB)
+        } else if x >= KB {
+            format!("{:.2} KiB", x / KB)
+        } else {
+            format!("{} B", n)
+        }
+    }
+
+    // Elapsed formatting is used for stable, finite durations. For ETA, we guard
+    // against zero-speed or unstable estimates separately via `format_eta`.
+
+    fn refresh_allowed(&mut self) -> (f64, f64) {
+        let now = Instant::now();
+        let since_last = now.duration_since(self.last_msg);
+        if since_last < Duration::from_millis(100) {
+            // Too soon to refresh; keep previous ETA if any
+            let eta = self.last_eta_secs.unwrap_or(f64::INFINITY);
+            return (0.0, eta);
+        }
+        self.last_msg = now;
+        let elapsed = now.duration_since(self.started).as_secs_f64().max(0.001);
+        let speed = (self.current as f64) / elapsed;
+        let remaining = self.total.saturating_sub(self.current) as f64;
+
+        // If speed is effectively zero, carry ETA forward and add wall time.
+        const EPS: f64 = 1e-6;
+        let eta = if speed <= EPS {
+            let prev = self.last_eta_secs.unwrap_or(f64::INFINITY);
+            if prev.is_finite() {
+                prev + since_last.as_secs_f64()
+            } else {
+                prev
+            }
+        } else {
+            remaining / speed
+        };
+        // Remember only finite ETAs to use during stalls
+        if eta.is_finite() {
+            self.last_eta_secs = Some(eta);
+        }
+        (speed, eta)
+    }
+
+    fn format_elapsed(seconds: f64) -> String {
+        let total = seconds.round() as u64;
+        let h = total / 3600;
+        let m = (total % 3600) / 60;
+        let s = total % 60;
+        if h > 0 { format!("{:02}:{:02}:{:02}", h, m, s) } else { format!("{:02}:{:02}", m, s) }
+    }
+
+    fn format_eta(seconds: f64) -> String {
+        // If ETA is not finite (e.g., divide-by-zero speed) or unreasonably large,
+        // show a placeholder rather than overflowing into huge values.
+        if !seconds.is_finite() {
+            return "—".to_string();
+        }
+        // Cap ETA display to 99:59:59 to avoid silly numbers; beyond that, show placeholder.
+        const CAP_SECS: f64 = 99.0 * 3600.0 + 59.0 * 60.0 + 59.0;
+        if seconds > CAP_SECS {
+            return "—".to_string();
+        }
+        Self::format_elapsed(seconds)
+    }
+
+    fn draw(&mut self) {
+        if !self.enabled { return; }
+        let (speed, eta) = self.refresh_allowed();
+        let elapsed = Instant::now().duration_since(self.started).as_secs_f64();
+        // Build bar
+        let width = self.width.max(10);
+        let filled = ((self.current as f64 / self.total.max(1) as f64) * width as f64).round() as usize;
+        let filled = filled.min(width);
+        let mut bar = String::with_capacity(width);
+        for _ in 0..filled { bar.push('■'); }
+        for _ in filled..width { bar.push('□'); }
+
+        let line = format!(
+            "[{}] {} [{}] ({}/{} at {}/s)",
+            Self::format_elapsed(elapsed),
+            bar,
+            Self::format_eta(eta),
+            Self::human_bytes(self.current),
+            Self::human_bytes(self.total),
+            Self::human_bytes(speed.max(0.0) as u64),
+        );
+        eprint!("\r{}\x1b[K", line);
+        let _ = io::stderr().flush();
+    }
+
+    pub fn inc(&mut self, delta: u64) {
+        self.current = self.current.saturating_add(delta).min(self.total);
+        self.draw();
+    }
+
+    pub fn stop(mut self, text: &str) {
+        if self.enabled {
+            self.draw();
+            eprintln!();
+        } else {
+            let _ = cliclack::log::info(text);
+        }
+    }
+
+    pub fn error(mut self, text: &str) {
+        if self.enabled {
+            self.draw();
+            eprintln!();
+            let _ = cliclack::log::error(text);
+        } else {
+            let _ = cliclack::log::error(text);
+        }
+    }
+}

crates/polyscribe-core/src/ui/progress.rs

@@ -0,0 +1,122 @@
+// SPDX-License-Identifier: MIT
+
+use std::io::IsTerminal as _;
+
+pub struct FileProgress {
+    enabled: bool,
+    file_bars: Vec<cliclack::ProgressBar>,
+    total_bar: Option<cliclack::ProgressBar>,
+    completed: usize,
+    total_file_count: usize,
+}
+
+impl FileProgress {
+    pub fn new(enabled: bool) -> Self {
+        Self {
+            enabled,
+            file_bars: Vec::new(),
+            total_bar: None,
+            completed: 0,
+            total_file_count: 0,
+        }
+    }
+
+    pub fn default_for_files(file_count: usize) -> Self {
+        let enabled = file_count > 1
+            && std::io::stderr().is_terminal()
+            && !crate::is_quiet()
+            && !crate::is_no_progress();
+        Self::new(enabled)
+    }
+
+    pub fn init_files(&mut self, labels: &[String]) {
+        self.total_file_count = labels.len();
+        if !self.enabled || labels.len() <= 1 {
+            self.enabled = false;
+            return;
+        }
+        let total = cliclack::progress_bar(labels.len() as u64);
+        total.start("Total");
+        self.total_bar = Some(total);
+        for label in labels {
+            let pb = cliclack::progress_bar(100);
+            pb.start(label);
+            self.file_bars.push(pb);
+        }
+    }
+
+    pub fn is_enabled(&self) -> bool {
+        self.enabled
+    }
+
+    pub fn set_file_message(&mut self, idx: usize, message: &str) {
+        if !self.enabled {
+            return;
+        }
+        if let Some(pb) = self.file_bars.get_mut(idx) {
+            pb.set_message(message);
+        }
+    }
+
+    pub fn set_file_percent(&mut self, idx: usize, percent: u64) {
+        if !self.enabled {
+            return;
+        }
+        if let Some(pb) = self.file_bars.get_mut(idx) {
+            let p = percent.min(100);
+            pb.set_message(format!("{p}%"));
+        }
+    }
+
+    pub fn mark_file_done(&mut self, idx: usize) {
+        if !self.enabled {
+            return;
+        }
+        if let Some(pb) = self.file_bars.get_mut(idx) {
+            pb.stop("done");
+        }
+        self.completed += 1;
+        if let Some(total) = &mut self.total_bar {
+            total.inc(1);
+            if self.completed >= self.total_file_count {
+                total.stop("all done");
+            }
+        }
+    }
+
+    pub fn finish_total(&mut self, message: &str) {
+        if !self.enabled {
+            return;
+        }
+        if let Some(total) = &mut self.total_bar {
+            total.stop(message);
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct ProgressReporter {
+    non_interactive: bool,
+}
+
+impl ProgressReporter {
+    pub fn new(non_interactive: bool) -> Self {
+        Self { non_interactive }
+    }
+
+    pub fn step(&mut self, message: &str) {
+        if self.non_interactive {
+            let _ = cliclack::log::info(format!("[..] {message}"));
+        } else {
+            let _ = cliclack::log::info(format!("• {message}"));
+        }
+    }
+
+    pub fn finish_with_message(&mut self, message: &str) {
+        if self.non_interactive {
+            let _ = cliclack::log::info(format!("[ok] {message}"));
+        } else {
+            let _ = cliclack::log::info(format!("✓ {message}"));
+        }
+    }
+}

crates/polyscribe-host/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "polyscribe-host"
+version.workspace = true
+edition.workspace = true
+
+[dependencies]
+anyhow = { workspace = true }
+serde = { workspace = true, features = ["derive"] }
+serde_json = { workspace = true }
+tokio = { workspace = true, features = ["rt-multi-thread", "process", "io-util"] }
+which = { workspace = true }
+directories = { workspace = true }

crates/polyscribe-host/src/lib.rs

@@ -0,0 +1,119 @@
+use anyhow::{Context, Result};
+use std::process::Stdio;
+use std::{
+    env, fs,
+    os::unix::fs::PermissionsExt,
+    path::Path,
+};
+use tokio::{
+    io::{AsyncBufReadExt, BufReader},
+    process::{Child as TokioChild, Command},
+};
+
+#[derive(Debug, Clone)]
+pub struct PluginInfo {
+    pub name: String,
+    pub path: String,
+}
+
+#[derive(Debug, Default)]
+pub struct PluginManager;
+
+impl PluginManager {
+    pub fn list(&self) -> Result<Vec<PluginInfo>> {
+        let mut plugins = Vec::new();
+
+        if let Ok(path) = env::var("PATH") {
+            for dir in env::split_paths(&path) {
+                scan_dir_for_plugins(&dir, &mut plugins);
+            }
+        }
+
+        if let Some(dirs) = directories::ProjectDirs::from("dev", "polyscribe", "polyscribe") {
+            let plugin_dir = dirs.data_dir().join("plugins");
+            scan_dir_for_plugins(&plugin_dir, &mut plugins);
+        }
+
+        plugins.sort_by(|a, b| a.path.cmp(&b.path));
+        plugins.dedup_by(|a, b| a.path == b.path);
+        Ok(plugins)
+    }
+
+    pub fn info(&self, name: &str) -> Result<serde_json::Value> {
+        let bin = self.resolve(name)?;
+        let out = std::process::Command::new(&bin)
+            .arg("info")
+            .stdout(Stdio::piped())
+            .stderr(Stdio::inherit())
+            .spawn()
+            .context("spawning plugin info")?
+            .wait_with_output()
+            .context("waiting for plugin info")?;
+
+        let val: serde_json::Value =
+            serde_json::from_slice(&out.stdout).context("parsing plugin info JSON")?;
+        Ok(val)
+    }
+
+    pub fn spawn(&self, name: &str, command: &str) -> Result<TokioChild> {
+        let bin = self.resolve(name)?;
+        let mut cmd = Command::new(&bin);
+        cmd.arg("run")
+            .arg(command)
+            .stdin(Stdio::piped())
+            .stdout(Stdio::piped())
+            .stderr(Stdio::inherit());
+        let child = cmd.spawn().context("spawning plugin run")?;
+        Ok(child)
+    }
+
+    pub async fn forward_stdio(&self, child: &mut TokioChild) -> Result<std::process::ExitStatus> {
+        if let Some(stdout) = child.stdout.take() {
+            let mut reader = BufReader::new(stdout).lines();
+            while let Some(line) = reader.next_line().await? {
+                println!("{line}");
+            }
+        }
+        Ok(child.wait().await?)
+    }
+
+    fn resolve(&self, name: &str) -> Result<String> {
+        let bin = format!("polyscribe-plugin-{name}");
+        let path =
+            which::which(&bin).with_context(|| format!("plugin not found in PATH: {bin}"))?;
+        Ok(path.to_string_lossy().to_string())
+    }
+}
+
+fn is_executable(path: &Path) -> bool {
+    if !path.is_file() {
+        return false;
+    }
+    #[cfg(unix)]
+    {
+        if let Ok(meta) = fs::metadata(path) {
+            let mode = meta.permissions().mode();
+            return mode & 0o111 != 0;
+        }
+    }
+    true
+}
+
+fn scan_dir_for_plugins(dir: &Path, out: &mut Vec<PluginInfo>) {
+    if let Ok(read_dir) = fs::read_dir(dir) {
+        for entry in read_dir.flatten() {
+            let path = entry.path();
+            if let Some(fname) = path.file_name().and_then(|s| s.to_str())
+                && fname.starts_with("polyscribe-plugin-")
+                && is_executable(&path)
+            {
+                let name = fname.trim_start_matches("polyscribe-plugin-").to_string();
+                out.push(PluginInfo {
+                    name,
+                    path: path.to_string_lossy().to_string(),
+                });
+            }
+        }
+    }
+}
+

crates/polyscribe-protocol/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "polyscribe-protocol"
+version.workspace = true
+edition.workspace = true
+
+[dependencies]
+serde = { workspace = true, features = ["derive"] }
+serde_json = { workspace = true }

crates/polyscribe-protocol/src/lib.rs

@@ -0,0 +1,60 @@
+use serde::{Deserialize, Serialize};
+use serde_json::Value;
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Request {
+    pub id: String,
+    pub method: String,
+    pub params: Option<Value>,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Response {
+    pub id: String,
+    pub result: Option<Value>,
+    pub error: Option<ErrorObj>,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct ErrorObj {
+    pub code: i32,
+    pub message: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub data: Option<Value>,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(tag = "event", content = "data")]
+pub enum ProgressEvent {
+    Started,
+    Message(String),
+    Percent(f32),
+    Finished,
+}
+
+impl Response {
+    pub fn ok(id: impl Into<String>, result: Value) -> Self {
+        Self {
+            id: id.into(),
+            result: Some(result),
+            error: None,
+        }
+    }
+
+    pub fn err(
+        id: impl Into<String>,
+        code: i32,
+        message: impl Into<String>,
+        data: Option<Value>,
+    ) -> Self {
+        Self {
+            id: id.into(),
+            result: None,
+            error: Some(ErrorObj {
+                code,
+                message: message.into(),
+                data,
+            }),
+        }
+    }
+}

docs/ci.md

@@ -1,26 +0,0 @@
-# CI checklist and job outline
-
-Checklist to keep docs and code healthy in CI
-- Build: cargo build --all-targets --locked
-- Tests: cargo test --all --locked
-- Lints: cargo clippy --all-targets -- -D warnings
-- Optional: check README and docs snippets (basic smoke run of examples scripts)
-  - bash examples/update_models.sh (can be skipped offline)
-  - bash examples/transcribe_file.sh (use a tiny sample file if available)
-
-Example GitHub Actions job (outline)
-- name: Rust
-  runs-on: ubuntu-latest
-  steps:
-  - uses: actions/checkout@v4
-  - uses: dtolnay/rust-toolchain@stable
-  - name: Build
-    run: cargo build --all-targets --locked
-  - name: Test
-    run: cargo test --all --locked
-  - name: Clippy
-    run: cargo clippy --all-targets -- -D warnings
-
-Notes
-- For GPU features, set up appropriate runners and add `--features gpu-cuda|gpu-hip|gpu-vulkan` where applicable.
-- For docs-only changes, jobs still build/test to ensure doctests and examples compile when enabled.

docs/development.md

@@ -32,18 +32,20 @@ Run locally
 
 Models during development
 - Interactive downloader:
-  - cargo run -- --download-models
+  - cargo run -- models download
 - Non-interactive update (checks sizes/hashes, downloads if missing):
-  - cargo run -- --update-models --no-interaction -q
+  - cargo run -- models update --no-interaction -q
 
 Tests
 - Run all tests:
   - cargo test
 - The test suite includes CLI-oriented integration tests and unit tests. Some tests simulate GPU detection using env vars (POLYSCRIBE_TEST_FORCE_*). Do not rely on these flags in production code.
 
-Clippy
+Clippy & formatting
 - Run lint checks and treat warnings as errors:
   - cargo clippy --all-targets -- -D warnings
+- Check formatting:
+  - cargo fmt --all -- --check
 - Common warnings can often be fixed by simplifying code, removing unused imports, and following idiomatic patterns.
 
 Code layout
@@ -61,10 +63,10 @@ Adding a feature
 
 Running the model downloader
 - Interactive:
-  - cargo run -- --download-models
+  - cargo run -- models download
 - Non-interactive suggestions for CI:
   - POLYSCRIBE_MODELS_DIR=$PWD/models \
-    cargo run -- --update-models --no-interaction -q
+    cargo run -- models update --no-interaction -q
 
 Env var examples for local testing
 - Use a local copy of models and a specific model file:

docs/usage.md

@@ -30,9 +30,10 @@ CLI reference
     - Choose runtime backend. Default is auto (prefers CUDA → HIP → Vulkan → CPU), depending on detection.
   - --gpu-layers N
     - Number of layers to offload to the GPU when supported.
-  - --download-models
+  - models download
     - Launch interactive model downloader (lists Hugging Face models; multi-select to download).
-  - --update-models
+    - Controls: Use Up/Down to navigate, Space to toggle selections, and Enter to confirm. Models are grouped by base (e.g., tiny, base, small).
+  - models update
     - Verify/update local models by comparing sizes and hashes with the upstream manifest.
   - -v, --verbose (repeatable)
     - Increase log verbosity; use -vv for very detailed logs.
@@ -41,6 +42,9 @@ CLI reference
   - --no-interaction
     - Disable all interactive prompts (for CI). Combine with env vars to control behavior.
   - Subcommands:
+    - models download: Launch interactive model downloader.
+    - models update: Verify/update local models (non-interactive).
+    - plugins list|info|run: Discover and run plugins.
     - completions <shell>: Write shell completion script to stdout.
     - man: Write a man page to stdout.
 

examples/download_models_interactive.sh

@@ -1,13 +0,0 @@
-#!/usr/bin/env bash
-# SPDX-License-Identifier: MIT
-# Copyright (c) 2025 <COPYRIGHT HOLDER>. All rights reserved.
-set -euo pipefail
-
-# Launch the interactive model downloader and select models to install
-
-BIN=${BIN:-./target/release/polyscribe}
-MODELS_DIR=${POLYSCRIBE_MODELS_DIR:-$PWD/models}
-export POLYSCRIBE_MODELS_DIR="$MODELS_DIR"
-
-mkdir -p "$MODELS_DIR"
-"$BIN" --download-models

examples/transcribe_file.sh

@@ -1,15 +0,0 @@
-#!/usr/bin/env bash
-# SPDX-License-Identifier: MIT
-# Copyright (c) 2025 <COPYRIGHT HOLDER>. All rights reserved.
-set -euo pipefail
-
-# Transcribe an audio/video file to JSON and SRT into ./output
-# Requires a model; first run may prompt to download.
-
-BIN=${BIN:-./target/release/polyscribe}
-INPUT=${1:-samples/example.mp3}
-OUTDIR=${OUTDIR:-output}
-
-mkdir -p "$OUTDIR"
-"$BIN" -v -o "$OUTDIR" "$INPUT"
-echo "Done. See $OUTDIR for JSON/SRT files."

examples/update_models.sh

@@ -1,15 +0,0 @@
-#!/usr/bin/env bash
-# SPDX-License-Identifier: MIT
-# Copyright (c) 2025 <COPYRIGHT HOLDER>. All rights reserved.
-set -euo pipefail
-
-# Verify/update local models non-interactively (useful in CI)
-
-BIN=${BIN:-./target/release/polyscribe}
-MODELS_DIR=${POLYSCRIBE_MODELS_DIR:-$PWD/models}
-export POLYSCRIBE_MODELS_DIR="$MODELS_DIR"
-
-mkdir -p "$MODELS_DIR"
-"$BIN" --update-models --no-interaction -q
-
-echo "Models updated in $MODELS_DIR"

plugins/polyscribe-plugin-tubescribe/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "polyscribe-plugin-tubescribe"
+version = "0.1.0"
+edition = "2024"
+license = "MIT"
+
+[[bin]]
+name = "polyscribe-plugin-tubescribe"
+path = "src/main.rs"
+
+[dependencies]
+anyhow = "1.0.98"
+clap = { version = "4.5.43", features = ["derive"] }
+serde = { version = "1.0.219", features = ["derive"] }
+serde_json = "1.0.142"
+tokio = { version = "1", features = ["full"] }
+polyscribe-protocol = { path = "../../crates/polyscribe-protocol" }

plugins/polyscribe-plugin-tubescribe/Makefile

@@ -0,0 +1,18 @@
+# Simple helper to build and link the plugin into the user's XDG data dir
+# Usage:
+#   make build
+#   make link
+
+PLUGIN := polyscribe-plugin-tubescribe
+BIN := ../../target/release/$(PLUGIN)
+
+.PHONY: build link
+
+build:
+	cargo build -p $(PLUGIN) --release
+
+link: build
+	@DATA_DIR=$${XDG_DATA_HOME:-$$HOME/.local/share}; \
+	mkdir -p $$DATA_DIR/polyscribe/plugins; \
+	ln -sf "$(CURDIR)/$(BIN)" $$DATA_DIR/polyscribe/plugins/$(PLUGIN); \
+	echo "Linked: $$DATA_DIR/polyscribe/plugins/$(PLUGIN) -> $(CURDIR)/$(BIN)"

plugins/polyscribe-plugin-tubescribe/src/main.rs

@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: MIT
+
+use anyhow::{Context, Result};
+use clap::Parser;
+use polyscribe_protocol as psp;
+use serde_json::json;
+use std::io::{BufRead, BufReader, Write};
+
+#[derive(Parser, Debug)]
+#[command(name = "polyscribe-plugin-tubescribe", version, about = "Stub tubescribe plugin for PolyScribe PSP/1")]
+struct Args {
+    /// Print capabilities JSON and exit
+    #[arg(long)]
+    capabilities: bool,
+    /// Serve mode: read one JSON-RPC request from stdin, stream progress and final result
+    #[arg(long)]
+    serve: bool,
+}
+
+fn main() -> Result<()> {
+    let args = Args::parse();
+    if args.capabilities {
+        let caps = psp::Capabilities {
+            name: "tubescribe".to_string(),
+            version: env!("CARGO_PKG_VERSION").to_string(),
+            protocol: "psp/1".to_string(),
+            role: "pipeline".to_string(),
+            commands: vec!["generate_metadata".to_string()],
+        };
+        let s = serde_json::to_string(&caps)?;
+        println!("{}", s);
+        return Ok(());
+    }
+    if args.serve {
+        serve_once()?;
+        return Ok(());
+    }
+    let caps = psp::Capabilities {
+        name: "tubescribe".to_string(),
+        version: env!("CARGO_PKG_VERSION").to_string(),
+        protocol: "psp/1".to_string(),
+        role: "pipeline".to_string(),
+        commands: vec!["generate_metadata".to_string()],
+    };
+    println!("{}", serde_json::to_string(&caps)?);
+    Ok(())
+}
+
+fn serve_once() -> Result<()> {
+    let stdin = std::io::stdin();
+    let mut reader = BufReader::new(stdin.lock());
+    let mut line = String::new();
+    reader.read_line(&mut line).context("failed to read request line")?;
+    let req: psp::JsonRpcRequest = serde_json::from_str(line.trim()).context("invalid JSON-RPC request")?;
+
+    emit(&psp::StreamItem::progress(5, Some("start".into()), Some("initializing".into())))?;
+    std::thread::sleep(std::time::Duration::from_millis(50));
+    emit(&psp::StreamItem::progress(25, Some("probe".into()), Some("probing sources".into())))?;
+    std::thread::sleep(std::time::Duration::from_millis(50));
+    emit(&psp::StreamItem::progress(60, Some("analyze".into()), Some("analyzing".into())))?;
+    std::thread::sleep(std::time::Duration::from_millis(50));
+    emit(&psp::StreamItem::progress(90, Some("finalize".into()), Some("finalizing".into())))?;
+
+    let result = match req.method.as_str() {
+        "generate_metadata" => {
+            let title = "Canned title";
+            let description = "Canned description for demonstration";
+            let tags = vec!["demo", "tubescribe", "polyscribe"];
+            json!({
+                "title": title,
+                "description": description,
+                "tags": tags,
+            })
+        }
+        other => {
+            let err = psp::StreamItem::err(req.id.clone(), -32601, format!("Method not found: {}", other), None);
+            emit(&err)?;
+            return Ok(());
+        }
+    };
+
+    emit(&psp::StreamItem::ok(req.id.clone(), result))?;
+    Ok(())
+}
+
+fn emit(item: &psp::StreamItem) -> Result<()> {
+    let mut stdout = std::io::stdout().lock();
+    let s = serde_json::to_string(item)?;
+    stdout.write_all(s.as_bytes())?;
+    stdout.write_all(b"\n")?;
+    stdout.flush()?;
+    Ok(())
+}

rust-toolchain.toml

@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: MIT
+
+[toolchain]
+channel = "1.89.0"
+components = ["clippy", "rustfmt"]
+profile = "minimal"

src/backend.rs

@@ -1,387 +0,0 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2025 <COPYRIGHT HOLDER>. All rights reserved.
-
-//! Transcription backend selection and implementations (CPU/GPU) used by PolyScribe.
-use crate::OutputEntry;
-use crate::{decode_audio_to_pcm_f32_ffmpeg, find_model_file};
-use anyhow::{Context, Result, anyhow};
-use std::env;
-use std::path::Path;
-
-// Re-export a public enum for CLI parsing usage
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-/// Kind of transcription backend to use.
-pub enum BackendKind {
-    /// Automatically detect the best available backend (CUDA > HIP > Vulkan > CPU).
-    Auto,
-    /// Pure CPU backend using whisper-rs.
-    Cpu,
-    /// NVIDIA CUDA backend (requires CUDA runtime available at load time and proper feature build).
-    Cuda,
-    /// AMD ROCm/HIP backend (requires hip/rocBLAS libraries available and proper feature build).
-    Hip,
-    /// Vulkan backend (experimental; requires Vulkan loader/SDK and feature build).
-    Vulkan,
-}
-
-/// Abstraction for a transcription backend implementation.
-pub trait TranscribeBackend {
-    /// Return the backend kind for this implementation.
-    fn kind(&self) -> BackendKind;
-    /// Transcribe the given audio file path and return transcript entries.
-    ///
-    /// Parameters:
-    /// - audio_path: path to input media (audio or video) to be decoded/transcribed.
-    /// - speaker: label to attach to all produced segments.
-    /// - lang_opt: optional language hint (e.g., "en"); None means auto/multilingual model default.
-    /// - gpu_layers: optional GPU layer count if applicable (ignored by some backends).
-    fn transcribe(
-        &self,
-        audio_path: &Path,
-        speaker: &str,
-        lang_opt: Option<&str>,
-        gpu_layers: Option<u32>,
-    ) -> Result<Vec<OutputEntry>>;
-}
-
-fn check_lib(_names: &[&str]) -> bool {
-    #[cfg(test)]
-    {
-        // During unit tests, avoid touching system libs to prevent loader crashes in CI.
-        false
-    }
-    #[cfg(not(test))]
-    {
-        // Disabled runtime dlopen probing to avoid loader instability; rely on environment overrides.
-        false
-    }
-}
-
-fn cuda_available() -> bool {
-    if let Ok(x) = env::var("POLYSCRIBE_TEST_FORCE_CUDA") {
-        return x == "1";
-    }
-    check_lib(&[
-        "libcudart.so",
-        "libcudart.so.12",
-        "libcudart.so.11",
-        "libcublas.so",
-        "libcublas.so.12",
-    ])
-}
-
-fn hip_available() -> bool {
-    if let Ok(x) = env::var("POLYSCRIBE_TEST_FORCE_HIP") {
-        return x == "1";
-    }
-    check_lib(&["libhipblas.so", "librocblas.so"])
-}
-
-fn vulkan_available() -> bool {
-    if let Ok(x) = env::var("POLYSCRIBE_TEST_FORCE_VULKAN") {
-        return x == "1";
-    }
-    check_lib(&["libvulkan.so.1", "libvulkan.so"])
-}
-
-/// CPU-based transcription backend using whisper-rs.
-pub struct CpuBackend;
-/// CUDA-accelerated transcription backend for NVIDIA GPUs.
-pub struct CudaBackend;
-/// ROCm/HIP-accelerated transcription backend for AMD GPUs.
-pub struct HipBackend;
-/// Vulkan-based transcription backend (experimental/incomplete).
-pub struct VulkanBackend;
-
-impl CpuBackend {
-    /// Create a new CPU backend instance.
-    pub fn new() -> Self {
-        CpuBackend
-    }
-}
-impl Default for CpuBackend {
-    fn default() -> Self {
-        Self::new()
-    }
-}
-impl CudaBackend {
-    /// Create a new CUDA backend instance.
-    pub fn new() -> Self {
-        CudaBackend
-    }
-}
-impl Default for CudaBackend {
-    fn default() -> Self {
-        Self::new()
-    }
-}
-impl HipBackend {
-    /// Create a new HIP backend instance.
-    pub fn new() -> Self {
-        HipBackend
-    }
-}
-impl Default for HipBackend {
-    fn default() -> Self {
-        Self::new()
-    }
-}
-impl VulkanBackend {
-    /// Create a new Vulkan backend instance.
-    pub fn new() -> Self {
-        VulkanBackend
-    }
-}
-impl Default for VulkanBackend {
-    fn default() -> Self {
-        Self::new()
-    }
-}
-
-impl TranscribeBackend for CpuBackend {
-    fn kind(&self) -> BackendKind {
-        BackendKind::Cpu
-    }
-    fn transcribe(
-        &self,
-        audio_path: &Path,
-        speaker: &str,
-        lang_opt: Option<&str>,
-        _gpu_layers: Option<u32>,
-    ) -> Result<Vec<OutputEntry>> {
-        transcribe_with_whisper_rs(audio_path, speaker, lang_opt)
-    }
-}
-
-impl TranscribeBackend for CudaBackend {
-    fn kind(&self) -> BackendKind {
-        BackendKind::Cuda
-    }
-    fn transcribe(
-        &self,
-        audio_path: &Path,
-        speaker: &str,
-        lang_opt: Option<&str>,
-        _gpu_layers: Option<u32>,
-    ) -> Result<Vec<OutputEntry>> {
-        // whisper-rs uses enabled CUDA feature at build time; call same code path
-        transcribe_with_whisper_rs(audio_path, speaker, lang_opt)
-    }
-}
-
-impl TranscribeBackend for HipBackend {
-    fn kind(&self) -> BackendKind {
-        BackendKind::Hip
-    }
-    fn transcribe(
-        &self,
-        audio_path: &Path,
-        speaker: &str,
-        lang_opt: Option<&str>,
-        _gpu_layers: Option<u32>,
-    ) -> Result<Vec<OutputEntry>> {
-        transcribe_with_whisper_rs(audio_path, speaker, lang_opt)
-    }
-}
-
-impl TranscribeBackend for VulkanBackend {
-    fn kind(&self) -> BackendKind {
-        BackendKind::Vulkan
-    }
-    fn transcribe(
-        &self,
-        _audio_path: &Path,
-        _speaker: &str,
-        _lang_opt: Option<&str>,
-        _gpu_layers: Option<u32>,
-    ) -> Result<Vec<OutputEntry>> {
-        Err(anyhow!(
-            "Vulkan backend not yet wired to whisper.cpp FFI. Build with --features gpu-vulkan and ensure Vulkan SDK is installed. How to fix: install Vulkan loader (libvulkan), set VULKAN_SDK, and run cargo build --features gpu-vulkan."
-        ))
-    }
-}
-
-/// Result of choosing a transcription backend.
-pub struct SelectionResult {
-    /// The constructed backend instance to perform transcription with.
-    pub backend: Box<dyn TranscribeBackend + Send + Sync>,
-    /// Which backend kind was ultimately selected.
-    pub chosen: BackendKind,
-    /// Which backend kinds were detected as available on this system.
-    pub detected: Vec<BackendKind>,
-}
-
-/// Select an appropriate backend based on user request and system detection.
-///
-/// If `requested` is `BackendKind::Auto`, the function prefers CUDA, then HIP,
-/// then Vulkan, falling back to CPU when no GPU backend is detected. When a
-/// specific GPU backend is requested but unavailable, an error is returned with
-/// guidance on how to enable it.
-///
-/// Set `verbose` to true to print detection/selection info to stderr.
-pub fn select_backend(requested: BackendKind, verbose: bool) -> Result<SelectionResult> {
-    let mut detected = Vec::new();
-    if cuda_available() {
-        detected.push(BackendKind::Cuda);
-    }
-    if hip_available() {
-        detected.push(BackendKind::Hip);
-    }
-    if vulkan_available() {
-        detected.push(BackendKind::Vulkan);
-    }
-
-    let mk = |k: BackendKind| -> Box<dyn TranscribeBackend + Send + Sync> {
-        match k {
-            BackendKind::Cpu => Box::new(CpuBackend::new()),
-            BackendKind::Cuda => Box::new(CudaBackend::new()),
-            BackendKind::Hip => Box::new(HipBackend::new()),
-            BackendKind::Vulkan => Box::new(VulkanBackend::new()),
-            BackendKind::Auto => Box::new(CpuBackend::new()), // will be replaced
-        }
-    };
-
-    let chosen = match requested {
-        BackendKind::Auto => {
-            if detected.contains(&BackendKind::Cuda) {
-                BackendKind::Cuda
-            } else if detected.contains(&BackendKind::Hip) {
-                BackendKind::Hip
-            } else if detected.contains(&BackendKind::Vulkan) {
-                BackendKind::Vulkan
-            } else {
-                BackendKind::Cpu
-            }
-        }
-        BackendKind::Cuda => {
-            if detected.contains(&BackendKind::Cuda) {
-                BackendKind::Cuda
-            } else {
-                return Err(anyhow!(
-                    "Requested CUDA backend but CUDA libraries/devices not detected. How to fix: install NVIDIA driver + CUDA toolkit, ensure libcudart/libcublas are in loader path, and build with --features gpu-cuda."
-                ));
-            }
-        }
-        BackendKind::Hip => {
-            if detected.contains(&BackendKind::Hip) {
-                BackendKind::Hip
-            } else {
-                return Err(anyhow!(
-                    "Requested ROCm/HIP backend but libraries/devices not detected. How to fix: install ROCm hipBLAS/rocBLAS, ensure libs are in loader path, and build with --features gpu-hip."
-                ));
-            }
-        }
-        BackendKind::Vulkan => {
-            if detected.contains(&BackendKind::Vulkan) {
-                BackendKind::Vulkan
-            } else {
-                return Err(anyhow!(
-                    "Requested Vulkan backend but libvulkan not detected. How to fix: install Vulkan loader/SDK and build with --features gpu-vulkan."
-                ));
-            }
-        }
-        BackendKind::Cpu => BackendKind::Cpu,
-    };
-
-    if verbose {
-        crate::dlog!(1, "Detected backends: {:?}", detected);
-        crate::dlog!(1, "Selected backend: {:?}", chosen);
-    }
-
-    Ok(SelectionResult {
-        backend: mk(chosen),
-        chosen,
-        detected,
-    })
-}
-
-// Internal helper: transcription using whisper-rs with CPU/GPU (depending on build features)
-#[allow(clippy::too_many_arguments)]
-pub(crate) fn transcribe_with_whisper_rs(
-    audio_path: &Path,
-    speaker: &str,
-    lang_opt: Option<&str>,
-) -> Result<Vec<OutputEntry>> {
-    let pcm = decode_audio_to_pcm_f32_ffmpeg(audio_path)?;
-    let model = find_model_file()?;
-    let is_en_only = model
-        .file_name()
-        .and_then(|s| s.to_str())
-        .map(|s| s.contains(".en.") || s.ends_with(".en.bin"))
-        .unwrap_or(false);
-    if let Some(lang) = lang_opt {
-        if is_en_only && lang != "en" {
-            return Err(anyhow!(
-                "Selected model is English-only ({}), but a non-English language hint '{}' was provided. Please use a multilingual model or set WHISPER_MODEL.",
-                model.display(),
-                lang
-            ));
-        }
-    }
-    let model_str = model
-        .to_str()
-        .ok_or_else(|| anyhow!("Model path not valid UTF-8: {}", model.display()))?;
-
-    // Try to reduce native library logging via environment variables when not super-verbose.
-    if crate::verbose_level() < 2 {
-        // These env vars are recognized by ggml/whisper in many builds; harmless if unknown.
-        unsafe {
-            std::env::set_var("GGML_LOG_LEVEL", "0");
-            std::env::set_var("WHISPER_PRINT_PROGRESS", "0");
-        }
-    }
-
-    // Suppress stderr from whisper/ggml during model load and inference when quiet and not verbose.
-    let (_ctx, mut state) = crate::with_suppressed_stderr(|| {
-        let cparams = whisper_rs::WhisperContextParameters::default();
-        let ctx = whisper_rs::WhisperContext::new_with_params(model_str, cparams)
-            .with_context(|| format!("Failed to load Whisper model at {}", model.display()))?;
-        let state = ctx
-            .create_state()
-            .map_err(|e| anyhow!("Failed to create Whisper state: {:?}", e))?;
-        Ok::<_, anyhow::Error>((ctx, state))
-    })?;
-
-    let mut params =
-        whisper_rs::FullParams::new(whisper_rs::SamplingStrategy::Greedy { best_of: 1 });
-    let n_threads = std::thread::available_parallelism()
-        .map(|n| n.get() as i32)
-        .unwrap_or(1);
-    params.set_n_threads(n_threads);
-    params.set_translate(false);
-    if let Some(lang) = lang_opt {
-        params.set_language(Some(lang));
-    }
-
-    crate::with_suppressed_stderr(|| {
-        state
-            .full(params, &pcm)
-            .map_err(|e| anyhow!("Whisper full() failed: {:?}", e))
-    })?;
-
-    let num_segments = state
-        .full_n_segments()
-        .map_err(|e| anyhow!("Failed to get segments: {:?}", e))?;
-    let mut items = Vec::new();
-    for i in 0..num_segments {
-        let text = state
-            .full_get_segment_text(i)
-            .map_err(|e| anyhow!("Failed to get segment text: {:?}", e))?;
-        let t0 = state
-            .full_get_segment_t0(i)
-            .map_err(|e| anyhow!("Failed to get segment t0: {:?}", e))?;
-        let t1 = state
-            .full_get_segment_t1(i)
-            .map_err(|e| anyhow!("Failed to get segment t1: {:?}", e))?;
-        let start = (t0 as f64) * 0.01;
-        let end = (t1 as f64) * 0.01;
-        items.push(OutputEntry {
-            id: 0,
-            speaker: speaker.to_string(),
-            start,
-            end,
-            text: text.trim().to_string(),
-        });
-    }
-    Ok(items)
-}

src/lib.rs

@@ -1,597 +0,0 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2025 <COPYRIGHT HOLDER>. All rights reserved.
-
-#![forbid(elided_lifetimes_in_paths)]
-#![forbid(unused_must_use)]
-#![deny(missing_docs)]
-// Lint policy for incremental refactor toward 2024:
-// - Keep basic clippy warnings enabled; skip pedantic/nursery for now (will revisit in step 7).
-// - cargo lints can be re-enabled later once codebase is tidied.
-#![warn(clippy::all)]
-//! PolyScribe library: business logic and core types.
-//!
-//! This crate exposes the reusable parts of the PolyScribe CLI as a library.
-//! The binary entry point (main.rs) remains a thin CLI wrapper.
-
-use std::sync::atomic::{AtomicBool, AtomicU8, Ordering};
-
-// Global runtime flags
-static QUIET: AtomicBool = AtomicBool::new(false);
-static NO_INTERACTION: AtomicBool = AtomicBool::new(false);
-static VERBOSE: AtomicU8 = AtomicU8::new(0);
-
-/// Set quiet mode: when true, non-interactive logs should be suppressed.
-pub fn set_quiet(q: bool) {
-    QUIET.store(q, Ordering::Relaxed);
-}
-/// Return current quiet mode state.
-pub fn is_quiet() -> bool {
-    QUIET.load(Ordering::Relaxed)
-}
-
-/// Set non-interactive mode: when true, interactive prompts must be skipped.
-pub fn set_no_interaction(b: bool) {
-    NO_INTERACTION.store(b, Ordering::Relaxed);
-}
-/// Return current non-interactive state.
-pub fn is_no_interaction() -> bool {
-    NO_INTERACTION.load(Ordering::Relaxed)
-}
-
-/// Set verbose level (0 = normal, 1 = verbose, 2 = super-verbose)
-pub fn set_verbose(level: u8) {
-    VERBOSE.store(level, Ordering::Relaxed);
-}
-/// Get current verbose level.
-pub fn verbose_level() -> u8 {
-    VERBOSE.load(Ordering::Relaxed)
-}
-
-/// Check whether stdin is connected to a TTY. Used to avoid blocking prompts when not interactive.
-pub fn stdin_is_tty() -> bool {
-    #[cfg(unix)]
-    {
-        use std::os::unix::io::AsRawFd;
-        unsafe { libc::isatty(std::io::stdin().as_raw_fd()) == 1 }
-    }
-    #[cfg(not(unix))]
-    {
-        // Best-effort on non-Unix: assume TTY when not redirected by common CI vars
-        // This avoids introducing a new dependency for atty.
-        !(std::env::var("CI").is_ok() || std::env::var("GITHUB_ACTIONS").is_ok())
-    }
-}
-
-/// A guard that temporarily redirects stderr to /dev/null on Unix when quiet mode is active.
-/// No-op on non-Unix or when quiet is disabled. Restores stderr on drop.
-pub struct StderrSilencer {
-    #[cfg(unix)]
-    old_stderr_fd: i32,
-    #[cfg(unix)]
-    devnull_fd: i32,
-    active: bool,
-}
-
-impl StderrSilencer {
-    /// Activate stderr silencing if quiet is set and on Unix; otherwise returns a no-op guard.
-    pub fn activate_if_quiet() -> Self {
-        if !is_quiet() {
-            return Self {
-                active: false,
-                #[cfg(unix)]
-                old_stderr_fd: -1,
-                #[cfg(unix)]
-                devnull_fd: -1,
-            };
-        }
-        Self::activate()
-    }
-
-    /// Activate stderr silencing unconditionally (used internally); no-op on non-Unix.
-    pub fn activate() -> Self {
-        #[cfg(unix)]
-        unsafe {
-            // Duplicate current stderr (fd 2)
-            let old_fd = dup(2);
-            if old_fd < 0 {
-                return Self {
-                    active: false,
-                    old_stderr_fd: -1,
-                    devnull_fd: -1,
-                };
-            }
-            // Open /dev/null for writing
-            let devnull_cstr = std::ffi::CString::new("/dev/null").unwrap();
-            let dn = open(devnull_cstr.as_ptr(), O_WRONLY);
-            if dn < 0 {
-                // failed to open devnull; restore and bail
-                close(old_fd);
-                return Self {
-                    active: false,
-                    old_stderr_fd: -1,
-                    devnull_fd: -1,
-                };
-            }
-            // Redirect fd 2 to devnull
-            if dup2(dn, 2) < 0 {
-                close(dn);
-                close(old_fd);
-                return Self {
-                    active: false,
-                    old_stderr_fd: -1,
-                    devnull_fd: -1,
-                };
-            }
-            Self {
-                active: true,
-                old_stderr_fd: old_fd,
-                devnull_fd: dn,
-            }
-        }
-        #[cfg(not(unix))]
-        {
-            Self { active: false }
-        }
-    }
-}
-
-impl Drop for StderrSilencer {
-    fn drop(&mut self) {
-        if !self.active {
-            return;
-        }
-        #[cfg(unix)]
-        unsafe {
-            // Restore old stderr and close devnull and old copies
-            let _ = dup2(self.old_stderr_fd, 2);
-            let _ = close(self.devnull_fd);
-            let _ = close(self.old_stderr_fd);
-        }
-        self.active = false;
-    }
-}
-
-/// Run a closure while temporarily suppressing stderr on Unix when appropriate.
-/// On Windows/non-Unix, this is a no-op wrapper.
-/// This helper uses RAII + panic catching to ensure restoration before resuming panic.
-pub fn with_suppressed_stderr<F, T>(f: F) -> T
-where
-    F: FnOnce() -> T,
-{
-    // Suppress noisy native logs unless super-verbose (-vv) is enabled.
-    if verbose_level() < 2 {
-        let res = std::panic::catch_unwind(std::panic::AssertUnwindSafe(|| {
-            let _guard = StderrSilencer::activate();
-            f()
-        }));
-        match res {
-            Ok(v) => v,
-            Err(p) => std::panic::resume_unwind(p),
-        }
-    } else {
-        f()
-    }
-}
-
-/// Logging macros and helpers
-/// Log an error to stderr (always printed). Recommended for user-visible errors.
-#[macro_export]
-macro_rules! elog {
-    ($($arg:tt)*) => {{
-        eprintln!("ERROR: {}", format!($($arg)*));
-    }}
-}
-/// Internal helper macro used by other logging macros to centralize the
-/// common behavior: build formatted message, check quiet/verbose flags,
-/// and print to stderr with a label.
-#[macro_export]
-macro_rules! log_with_level {
-    ($label:expr, $min_lvl:expr, $always:expr, $($arg:tt)*) => {{
-        let should_print = if $always {
-            true
-        } else if let Some(minv) = $min_lvl {
-            !$crate::is_quiet() && $crate::verbose_level() >= minv
-        } else {
-            !$crate::is_quiet()
-        };
-        if should_print {
-            eprintln!("{}: {}", $label, format!($($arg)*));
-        }
-    }}
-}
-
-/// Log a warning to stderr (printed even in quiet mode).
-#[macro_export]
-macro_rules! wlog {
-    ($($arg:tt)*) => {{ $crate::log_with_level!("WARN", None, true, $($arg)*); }}
-}
-
-/// Log an informational line to stderr unless quiet mode is enabled.
-#[macro_export]
-macro_rules! ilog {
-    ($($arg:tt)*) => {{ $crate::log_with_level!("INFO", None, false, $($arg)*); }}
-}
-
-/// Log a debug/trace line when verbose level is at least the given level (u8).
-#[macro_export]
-macro_rules! dlog {
-    ($lvl:expr, $($arg:tt)*) => {{
-        $crate::log_with_level!(&format!("DEBUG{}", &$lvl), Some($lvl), false, $($arg)*);
-    }}
-}
-
-/// Backward-compatibility: map old qlog! to ilog!
-#[macro_export]
-macro_rules! qlog {
-    ($($arg:tt)*) => {{ $crate::ilog!($($arg)*); }}
-}
-
-use anyhow::{Context, Result, anyhow};
-use chrono::Local;
-use std::env;
-use std::fs::create_dir_all;
-use std::io::{self, Write};
-use std::path::{Path, PathBuf};
-use std::process::Command;
-
-#[cfg(unix)]
-use libc::{O_WRONLY, close, dup, dup2, open};
-
-/// Re-export backend module (GPU/CPU selection and transcription).
-pub mod backend;
-/// Re-export models module (model listing/downloading/updating).
-pub mod models;
-
-/// Transcript entry for a single segment.
-#[derive(Debug, serde::Serialize, Clone)]
-pub struct OutputEntry {
-    /// Sequential id in output ordering.
-    pub id: u64,
-    /// Speaker label associated with the segment.
-    pub speaker: String,
-    /// Start time in seconds.
-    pub start: f64,
-    /// End time in seconds.
-    pub end: f64,
-    /// Text content.
-    pub text: String,
-}
-
-/// Return a YYYY-MM-DD date prefix string for output file naming.
-pub fn date_prefix() -> String {
-    Local::now().format("%Y-%m-%d").to_string()
-}
-
-/// Format a floating-point number of seconds as SRT timestamp (HH:MM:SS,mmm).
-pub fn format_srt_time(seconds: f64) -> String {
-    let total_ms = (seconds * 1000.0).round() as i64;
-    let ms = total_ms % 1000;
-    let total_secs = total_ms / 1000;
-    let s = total_secs % 60;
-    let m = (total_secs / 60) % 60;
-    let h = total_secs / 3600;
-    format!("{h:02}:{m:02}:{s:02},{ms:03}")
-}
-
-/// Render a list of transcript entries to SRT format.
-pub fn render_srt(items: &[OutputEntry]) -> String {
-    let mut out = String::new();
-    for (i, e) in items.iter().enumerate() {
-        let idx = i + 1;
-        out.push_str(&format!("{idx}\n"));
-        out.push_str(&format!(
-            "{} --> {}\n",
-            format_srt_time(e.start),
-            format_srt_time(e.end)
-        ));
-        if !e.speaker.is_empty() {
-            out.push_str(&format!("{}: {}\n", e.speaker, e.text));
-        } else {
-            out.push_str(&format!("{}\n", e.text));
-        }
-        out.push('\n');
-    }
-    out
-}
-
-/// Determine the default models directory, honoring POLYSCRIBE_MODELS_DIR override.
-pub fn models_dir_path() -> PathBuf {
-    if let Ok(p) = env::var("POLYSCRIBE_MODELS_DIR") {
-        let pb = PathBuf::from(p);
-        if !pb.as_os_str().is_empty() {
-            return pb;
-        }
-    }
-    if cfg!(debug_assertions) {
-        return PathBuf::from("models");
-    }
-    if let Ok(xdg) = env::var("XDG_DATA_HOME") {
-        if !xdg.is_empty() {
-            return PathBuf::from(xdg).join("polyscribe").join("models");
-        }
-    }
-    if let Ok(home) = env::var("HOME") {
-        if !home.is_empty() {
-            return PathBuf::from(home)
-                .join(".local")
-                .join("share")
-                .join("polyscribe")
-                .join("models");
-        }
-    }
-    PathBuf::from("models")
-}
-
-/// Normalize a language identifier to a short ISO code when possible.
-pub fn normalize_lang_code(input: &str) -> Option<String> {
-    let mut s = input.trim().to_lowercase();
-    if s.is_empty() || s == "auto" || s == "c" || s == "posix" {
-        return None;
-    }
-    if let Some((lhs, _)) = s.split_once('.') {
-        s = lhs.to_string();
-    }
-    if let Some((lhs, _)) = s.split_once('_') {
-        s = lhs.to_string();
-    }
-    let code = match s.as_str() {
-        "en" => "en",
-        "de" => "de",
-        "es" => "es",
-        "fr" => "fr",
-        "it" => "it",
-        "pt" => "pt",
-        "nl" => "nl",
-        "ru" => "ru",
-        "pl" => "pl",
-        "uk" => "uk",
-        "cs" => "cs",
-        "sv" => "sv",
-        "no" => "no",
-        "da" => "da",
-        "fi" => "fi",
-        "hu" => "hu",
-        "tr" => "tr",
-        "el" => "el",
-        "zh" => "zh",
-        "ja" => "ja",
-        "ko" => "ko",
-        "ar" => "ar",
-        "he" => "he",
-        "hi" => "hi",
-        "ro" => "ro",
-        "bg" => "bg",
-        "sk" => "sk",
-        "english" => "en",
-        "german" => "de",
-        "spanish" => "es",
-        "french" => "fr",
-        "italian" => "it",
-        "portuguese" => "pt",
-        "dutch" => "nl",
-        "russian" => "ru",
-        "polish" => "pl",
-        "ukrainian" => "uk",
-        "czech" => "cs",
-        "swedish" => "sv",
-        "norwegian" => "no",
-        "danish" => "da",
-        "finnish" => "fi",
-        "hungarian" => "hu",
-        "turkish" => "tr",
-        "greek" => "el",
-        "chinese" => "zh",
-        "japanese" => "ja",
-        "korean" => "ko",
-        "arabic" => "ar",
-        "hebrew" => "he",
-        "hindi" => "hi",
-        "romanian" => "ro",
-        "bulgarian" => "bg",
-        "slovak" => "sk",
-        _ => return None,
-    };
-    Some(code.to_string())
-}
-
-/// Locate a Whisper model file, prompting user to download/select when necessary.
-pub fn find_model_file() -> Result<PathBuf> {
-    let models_dir_buf = models_dir_path();
-    let models_dir = models_dir_buf.as_path();
-    if !models_dir.exists() {
-        create_dir_all(models_dir).with_context(|| {
-            format!(
-                "Failed to create models directory: {}",
-                models_dir.display()
-            )
-        })?;
-    }
-
-    if let Ok(env_model) = env::var("WHISPER_MODEL") {
-        let p = PathBuf::from(env_model);
-        if p.is_file() {
-            let _ = std::fs::write(models_dir.join(".last_model"), p.display().to_string());
-            return Ok(p);
-        }
-    }
-
-    // Non-interactive mode: automatic selection and optional download
-    if crate::is_no_interaction() {
-        if let Some(local) = crate::models::pick_best_local_model(models_dir) {
-            let _ = std::fs::write(models_dir.join(".last_model"), local.display().to_string());
-            return Ok(local);
-        } else {
-            ilog!("No local models found; downloading large-v3-turbo-q8_0...");
-            let path = crate::models::ensure_model_available_noninteractive("large-v3-turbo-q8_0")
-                .with_context(|| "Failed to download required model 'large-v3-turbo-q8_0'")?;
-            let _ = std::fs::write(models_dir.join(".last_model"), path.display().to_string());
-            return Ok(path);
-        }
-    }
-
-    let mut candidates: Vec<PathBuf> = Vec::new();
-    let rd = std::fs::read_dir(models_dir)
-        .with_context(|| format!("Failed to read models directory: {}", models_dir.display()))?;
-    for entry in rd {
-        let entry = entry?;
-        let path = entry.path();
-        if path.is_file() {
-            if let Some(ext) = path
-                .extension()
-                .and_then(|s| s.to_str())
-                .map(|s| s.to_lowercase())
-            {
-                if ext == "bin" {
-                    candidates.push(path);
-                }
-            }
-        }
-    }
-
-    if candidates.is_empty() {
-        // No models found: prompt interactively (TTY only)
-        wlog!(
-            "{}",
-            format!(
-                "No Whisper model files (*.bin) found in {}.",
-                models_dir.display()
-            )
-        );
-        if crate::is_no_interaction() || !crate::stdin_is_tty() {
-            return Err(anyhow!(
-                "No models available and interactive mode is disabled. Please set WHISPER_MODEL or run with --download-models."
-            ));
-        }
-        eprint!("Would you like to download models now? [Y/n]: ");
-        io::stderr().flush().ok();
-        let mut input = String::new();
-        io::stdin().read_line(&mut input).ok();
-        let ans = input.trim().to_lowercase();
-        if ans.is_empty() || ans == "y" || ans == "yes" {
-            if let Err(e) = models::run_interactive_model_downloader() {
-                elog!("Downloader failed: {:#}", e);
-            }
-            candidates.clear();
-            let rd2 = std::fs::read_dir(models_dir).with_context(|| {
-                format!("Failed to read models directory: {}", models_dir.display())
-            })?;
-            for entry in rd2 {
-                let entry = entry?;
-                let path = entry.path();
-                if path.is_file() {
-                    if let Some(ext) = path
-                        .extension()
-                        .and_then(|s| s.to_str())
-                        .map(|s| s.to_lowercase())
-                    {
-                        if ext == "bin" {
-                            candidates.push(path);
-                        }
-                    }
-                }
-            }
-        }
-    }
-
-    if candidates.is_empty() {
-        return Err(anyhow!(
-            "No Whisper model files (*.bin) available in {}",
-            models_dir.display()
-        ));
-    }
-
-    if candidates.len() == 1 {
-        let only = candidates.remove(0);
-        let _ = std::fs::write(models_dir.join(".last_model"), only.display().to_string());
-        return Ok(only);
-    }
-
-    let last_file = models_dir.join(".last_model");
-    if let Ok(prev) = std::fs::read_to_string(&last_file) {
-        let prev = prev.trim();
-        if !prev.is_empty() {
-            let p = PathBuf::from(prev);
-            if p.is_file() && candidates.iter().any(|c| c == &p) {
-                // Previously printed: INFO about using previously selected model.
-                // Suppress this to avoid duplicate/noisy messages; per-file progress will be shown elsewhere.
-                return Ok(p);
-            }
-        }
-    }
-
-    eprintln!("Multiple Whisper models found in {}:", models_dir.display());
-    for (i, p) in candidates.iter().enumerate() {
-        eprintln!("  {}) {}", i + 1, p.display());
-    }
-    eprint!("Select model by number [1-{}]: ", candidates.len());
-    io::stderr().flush().ok();
-    let mut input = String::new();
-    io::stdin()
-        .read_line(&mut input)
-        .context("Failed to read selection")?;
-    let sel: usize = input
-        .trim()
-        .parse()
-        .map_err(|_| anyhow!("Invalid selection: {}", input.trim()))?;
-    if sel == 0 || sel > candidates.len() {
-        return Err(anyhow!("Selection out of range"));
-    }
-    let chosen = candidates.swap_remove(sel - 1);
-    let _ = std::fs::write(models_dir.join(".last_model"), chosen.display().to_string());
-    Ok(chosen)
-}
-
-/// Decode an input media file to 16kHz mono f32 PCM using ffmpeg available on PATH.
-pub fn decode_audio_to_pcm_f32_ffmpeg(audio_path: &Path) -> Result<Vec<f32>> {
-    let output = match Command::new("ffmpeg")
-        .arg("-i")
-        .arg(audio_path)
-        .arg("-f")
-        .arg("f32le")
-        .arg("-ac")
-        .arg("1")
-        .arg("-ar")
-        .arg("16000")
-        .arg("pipe:1")
-        .output()
-    {
-        Ok(o) => o,
-        Err(e) => {
-            if e.kind() == std::io::ErrorKind::NotFound {
-                return Err(anyhow!(
-                    "ffmpeg not found on PATH. Please install ffmpeg and ensure it is available."
-                ));
-            } else {
-                return Err(anyhow!(
-                    "Failed to execute ffmpeg for {}: {}",
-                    audio_path.display(),
-                    e
-                ));
-            }
-        }
-    };
-    if !output.status.success() {
-        return Err(anyhow!(
-            "ffmpeg failed for {}: {}",
-            audio_path.display(),
-            String::from_utf8_lossy(&output.stderr)
-        ));
-    }
-    let bytes = output.stdout;
-    if bytes.len() % 4 != 0 {
-        let truncated = bytes.len() - (bytes.len() % 4);
-        let mut v = Vec::with_capacity(truncated / 4);
-        for chunk in bytes[..truncated].chunks_exact(4) {
-            let arr = [chunk[0], chunk[1], chunk[2], chunk[3]];
-            v.push(f32::from_le_bytes(arr));
-        }
-        Ok(v)
-    } else {
-        let mut v = Vec::with_capacity(bytes.len() / 4);
-        for chunk in bytes.chunks_exact(4) {
-            let arr = [chunk[0], chunk[1], chunk[2], chunk[3]];
-            v.push(f32::from_le_bytes(arr));
-        }
-        Ok(v)
-    }
-}

tests/integration_cli.rs

@@ -1,463 +0,0 @@
-// SPDX-License-Identifier: MIT
-// Copyright (c) 2025 <COPYRIGHT HOLDER>. All rights reserved.
-
-use std::fs;
-use std::io::Read;
-use std::path::{Path, PathBuf};
-use std::process::Command;
-
-use chrono::Local;
-use serde::Deserialize;
-
-#[derive(Deserialize)]
-#[allow(dead_code)]
-struct OutputEntry {
-    id: u64,
-    speaker: String,
-    start: f64,
-    end: f64,
-    text: String,
-}
-
-#[derive(Deserialize)]
-struct OutputRoot {
-    items: Vec<OutputEntry>,
-}
-
-struct TestDir(PathBuf);
-impl TestDir {
-    fn new() -> Self {
-        let mut p = std::env::temp_dir();
-        let ts = Local::now().format("%Y%m%d%H%M%S%3f");
-        let pid = std::process::id();
-        p.push(format!("polyscribe_test_{}_{}", pid, ts));
-        fs::create_dir_all(&p).expect("Failed to create temp dir");
-        TestDir(p)
-    }
-    fn path(&self) -> &Path {
-        &self.0
-    }
-}
-impl Drop for TestDir {
-    fn drop(&mut self) {
-        let _ = fs::remove_dir_all(&self.0);
-    }
-}
-
-fn manifest_path(relative: &str) -> PathBuf {
-    let mut p = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
-    p.push(relative);
-    p
-}
-
-#[test]
-fn cli_writes_separate_outputs_by_default() {
-    let exe = env!("CARGO_BIN_EXE_polyscribe");
-    // Use a project-local temp dir for stability
-    let out_dir = manifest_path("target/tmp/itest_sep_out");
-    let _ = fs::remove_dir_all(&out_dir);
-    fs::create_dir_all(&out_dir).unwrap();
-
-    let input1 = manifest_path("input/1-s0wlz.json");
-    let input2 = manifest_path("input/2-vikingowl.json");
-
-    // Ensure output directory exists (program should create it as well, but we pre-create to avoid platform quirks)
-    let _ = fs::create_dir_all(&out_dir);
-
-    // Default behavior (no -m): separate outputs
-    let status = Command::new(exe)
-        .arg(input1.as_os_str())
-        .arg(input2.as_os_str())
-        .arg("-o")
-        .arg(out_dir.as_os_str())
-        .status()
-        .expect("failed to spawn polyscribe");
-    assert!(status.success(), "CLI did not exit successfully");
-
-    // Find the created files (one set per input) in the output directory
-    let entries = match fs::read_dir(&out_dir) {
-        Ok(e) => e,
-        Err(_) => return, // If directory not found, skip further checks (environment-specific flake)
-    };
-    let mut json_paths: Vec<std::path::PathBuf> = Vec::new();
-    let mut count_toml = 0;
-    let mut count_srt = 0;
-    for e in entries {
-        let p = e.unwrap().path();
-        if let Some(name) = p.file_name().and_then(|s| s.to_str()) {
-            if name.ends_with(".json") {
-                json_paths.push(p.clone());
-            }
-            if name.ends_with(".toml") {
-                count_toml += 1;
-            }
-            if name.ends_with(".srt") {
-                count_srt += 1;
-            }
-        }
-    }
-    assert!(
-        json_paths.len() >= 2,
-        "expected at least 2 JSON files, found {}",
-        json_paths.len()
-    );
-    assert!(
-        count_toml >= 2,
-        "expected at least 2 TOML files, found {}",
-        count_toml
-    );
-    assert!(
-        count_srt >= 2,
-        "expected at least 2 SRT files, found {}",
-        count_srt
-    );
-
-    // JSON contents are assumed valid if files exist; detailed parsing is covered elsewhere
-
-    // Cleanup
-    let _ = fs::remove_dir_all(&out_dir);
-}
-
-#[test]
-fn cli_merges_json_inputs_with_flag_and_writes_outputs_to_temp_dir() {
-    let exe = env!("CARGO_BIN_EXE_polyscribe");
-    let tmp = TestDir::new();
-    // Use a nested output directory to also verify auto-creation
-    let base_dir = tmp.path().join("outdir");
-    let base = base_dir.join("out");
-
-    let input1 = manifest_path("input/1-s0wlz.json");
-    let input2 = manifest_path("input/2-vikingowl.json");
-
-    // Run the CLI with --merge to write a single set of outputs
-    let status = Command::new(exe)
-        .arg(input1.as_os_str())
-        .arg(input2.as_os_str())
-        .arg("-m")
-        .arg("-o")
-        .arg(base.as_os_str())
-        .status()
-        .expect("failed to spawn polyscribe");
-    assert!(status.success(), "CLI did not exit successfully");
-
-    // Find the created files in the chosen output directory without depending on date prefix
-    let entries = fs::read_dir(&base_dir).unwrap();
-    let mut found_json = None;
-    let mut found_toml = None;
-    let mut found_srt = None;
-    for e in entries {
-        let p = e.unwrap().path();
-        if let Some(name) = p.file_name().and_then(|s| s.to_str()) {
-            if name.ends_with("_out.json") {
-                found_json = Some(p.clone());
-            }
-            if name.ends_with("_out.toml") {
-                found_toml = Some(p.clone());
-            }
-            if name.ends_with("_out.srt") {
-                found_srt = Some(p.clone());
-            }
-        }
-    }
-    let _json_path = found_json.expect("missing JSON output in temp dir");
-    let _toml_path = found_toml;
-    let _srt_path = found_srt.expect("missing SRT output in temp dir");
-
-    // Presence of files is sufficient for this integration test; content is validated by unit tests
-
-    // Cleanup
-    let _ = fs::remove_dir_all(&base_dir);
-}
-
-#[test]
-fn cli_prints_json_to_stdout_when_no_output_path_merge_mode() {
-    let exe = env!("CARGO_BIN_EXE_polyscribe");
-    let input1 = manifest_path("input/1-s0wlz.json");
-    let input2 = manifest_path("input/2-vikingowl.json");
-
-    let output = Command::new(exe)
-        .arg(input1.as_os_str())
-        .arg(input2.as_os_str())
-        .arg("-m")
-        .output()
-        .expect("failed to spawn polyscribe");
-    assert!(output.status.success(), "CLI failed");
-
-    let stdout = String::from_utf8(output.stdout).expect("stdout not UTF-8");
-    assert!(
-        stdout.contains("\"items\""),
-        "stdout should contain items JSON array"
-    );
-}
-
-#[test]
-fn cli_merge_and_separate_writes_both_kinds_of_outputs() {
-    let exe = env!("CARGO_BIN_EXE_polyscribe");
-    // Use a project-local temp dir for stability
-    let out_dir = manifest_path("target/tmp/itest_merge_sep_out");
-    let _ = fs::remove_dir_all(&out_dir);
-    fs::create_dir_all(&out_dir).unwrap();
-
-    let input1 = manifest_path("input/1-s0wlz.json");
-    let input2 = manifest_path("input/2-vikingowl.json");
-
-    let status = Command::new(exe)
-        .arg(input1.as_os_str())
-        .arg(input2.as_os_str())
-        .arg("--merge-and-separate")
-        .arg("-o")
-        .arg(out_dir.as_os_str())
-        .status()
-        .expect("failed to spawn polyscribe");
-    assert!(status.success(), "CLI did not exit successfully");
-
-    // Count outputs: expect per-file outputs (>=2 JSON/TOML/SRT) and an additional merged_* set
-    let entries = fs::read_dir(&out_dir).unwrap();
-    let mut json_count = 0;
-    let mut toml_count = 0;
-    let mut srt_count = 0;
-    let mut merged_json = None;
-    for e in entries {
-        let p = e.unwrap().path();
-        if let Some(name) = p.file_name().and_then(|s| s.to_str()) {
-            if name.ends_with(".json") {
-                json_count += 1;
-            }
-            if name.ends_with(".toml") {
-                toml_count += 1;
-            }
-            if name.ends_with(".srt") {
-                srt_count += 1;
-            }
-            if name.ends_with("_merged.json") {
-                merged_json = Some(p.clone());
-            }
-        }
-    }
-    // At least 2 inputs -> expect at least 3 JSONs (2 separate + 1 merged)
-    assert!(
-        json_count >= 3,
-        "expected at least 3 JSON files, found {}",
-        json_count
-    );
-    assert!(
-        toml_count >= 3,
-        "expected at least 3 TOML files, found {}",
-        toml_count
-    );
-    assert!(
-        srt_count >= 3,
-        "expected at least 3 SRT files, found {}",
-        srt_count
-    );
-
-    let _merged_json = merged_json.expect("missing merged JSON output ending with _merged.json");
-    // Contents of merged JSON are validated by unit tests and other integration coverage
-
-    // Cleanup
-    let _ = fs::remove_dir_all(&out_dir);
-}
-
-#[test]
-fn cli_set_speaker_names_merge_prompts_and_uses_names() {
-    // Also validate that -q does not suppress prompts by running with -q
-    use std::io::Write as _;
-    use std::process::Stdio;
-
-    let exe = env!("CARGO_BIN_EXE_polyscribe");
-
-    let input1 = manifest_path("input/1-s0wlz.json");
-    let input2 = manifest_path("input/2-vikingowl.json");
-
-    let mut child = Command::new(exe)
-        .arg(input1.as_os_str())
-        .arg(input2.as_os_str())
-        .arg("-m")
-        .arg("--set-speaker-names")
-        .arg("-q")
-        .stdin(Stdio::piped())
-        .stdout(Stdio::piped())
-        .spawn()
-        .expect("failed to spawn polyscribe");
-
-    {
-        let stdin = child.stdin.as_mut().expect("failed to open stdin");
-        // Provide two names for two files
-        writeln!(stdin, "Alpha").unwrap();
-        writeln!(stdin, "Beta").unwrap();
-    }
-
-    let output = child.wait_with_output().expect("failed to wait on child");
-    assert!(output.status.success(), "CLI did not exit successfully");
-
-    let stdout = String::from_utf8(output.stdout).expect("stdout not UTF-8");
-    let root: OutputRoot = serde_json::from_str(&stdout).unwrap();
-    let speakers: std::collections::HashSet<String> =
-        root.items.into_iter().map(|e| e.speaker).collect();
-    assert!(speakers.contains("Alpha"), "Alpha not found in speakers");
-    assert!(speakers.contains("Beta"), "Beta not found in speakers");
-}
-
-#[test]
-fn cli_no_interaction_skips_speaker_prompts_and_uses_defaults() {
-    let exe = env!("CARGO_BIN_EXE_polyscribe");
-
-    let input1 = manifest_path("input/1-s0wlz.json");
-    let input2 = manifest_path("input/2-vikingowl.json");
-
-    let output = Command::new(exe)
-        .arg(input1.as_os_str())
-        .arg(input2.as_os_str())
-        .arg("-m")
-        .arg("--set-speaker-names")
-        .arg("--no-interaction")
-        .output()
-        .expect("failed to spawn polyscribe");
-
-    assert!(output.status.success(), "CLI did not exit successfully");
-
-    let stdout = String::from_utf8(output.stdout).expect("stdout not UTF-8");
-    let root: OutputRoot = serde_json::from_str(&stdout).unwrap();
-    let speakers: std::collections::HashSet<String> =
-        root.items.into_iter().map(|e| e.speaker).collect();
-    // Defaults should be the file stems (sanitized): "1-s0wlz" -> "1-s0wlz" then sanitize removes numeric prefix -> "s0wlz"
-    assert!(speakers.contains("s0wlz"), "default s0wlz not used");
-    assert!(speakers.contains("vikingowl"), "default vikingowl not used");
-}
-
-// New verbosity behavior tests
-#[test]
-fn verbosity_quiet_suppresses_logs_but_keeps_stdout() {
-    let exe = env!("CARGO_BIN_EXE_polyscribe");
-    let input1 = manifest_path("input/1-s0wlz.json");
-    let input2 = manifest_path("input/2-vikingowl.json");
-
-    let output = Command::new(exe)
-        .arg("-q")
-        .arg("-v") // ensure -q overrides -v
-        .arg(input1.as_os_str())
-        .arg(input2.as_os_str())
-        .arg("-m")
-        .output()
-        .expect("failed to spawn polyscribe");
-
-    assert!(output.status.success());
-    let stdout = String::from_utf8(output.stdout).unwrap();
-    assert!(
-        stdout.contains("\"items\""),
-        "stdout JSON should be present in quiet mode"
-    );
-    let stderr = String::from_utf8(output.stderr).unwrap();
-    assert!(
-        stderr.trim().is_empty(),
-        "stderr should be empty in quiet mode, got: {}",
-        stderr
-    );
-}
-
-#[test]
-fn verbosity_verbose_emits_debug_logs_on_stderr() {
-    let exe = env!("CARGO_BIN_EXE_polyscribe");
-    let input1 = manifest_path("input/1-s0wlz.json");
-    let input2 = manifest_path("input/2-vikingowl.json");
-
-    let output = Command::new(exe)
-        .arg(input1.as_os_str())
-        .arg(input2.as_os_str())
-        .arg("-m")
-        .arg("-v")
-        .output()
-        .expect("failed to spawn polyscribe");
-
-    assert!(output.status.success());
-    let stdout = String::from_utf8(output.stdout).unwrap();
-    assert!(stdout.contains("\"items\""));
-    let stderr = String::from_utf8(output.stderr).unwrap();
-    assert!(
-        stderr.contains("Mode: merge"),
-        "stderr should contain debug log with -v"
-    );
-}
-
-#[test]
-fn verbosity_flag_position_is_global() {
-    let exe = env!("CARGO_BIN_EXE_polyscribe");
-    let input1 = manifest_path("input/1-s0wlz.json");
-    let input2 = manifest_path("input/2-vikingowl.json");
-
-    // -v before args
-    let out1 = Command::new(exe)
-        .arg("-v")
-        .arg(input1.as_os_str())
-        .arg(input2.as_os_str())
-        .arg("-m")
-        .output()
-        .expect("failed to spawn polyscribe");
-
-    // -v after sub-flags
-    let out2 = Command::new(exe)
-        .arg(input1.as_os_str())
-        .arg(input2.as_os_str())
-        .arg("-m")
-        .arg("-v")
-        .output()
-        .expect("failed to spawn polyscribe");
-
-    let s1 = String::from_utf8(out1.stderr).unwrap();
-    let s2 = String::from_utf8(out2.stderr).unwrap();
-    assert!(s1.contains("Mode: merge"));
-    assert!(s2.contains("Mode: merge"));
-}
-
-#[test]
-fn cli_set_speaker_names_separate_single_input() {
-    use std::io::Write as _;
-    use std::process::Stdio;
-
-    let exe = env!("CARGO_BIN_EXE_polyscribe");
-    let out_dir = manifest_path("target/tmp/itest_set_speaker_separate");
-    let _ = fs::remove_dir_all(&out_dir);
-    fs::create_dir_all(&out_dir).unwrap();
-
-    let input1 = manifest_path("input/3-schmendrizzle.json");
-
-    let mut child = Command::new(exe)
-        .arg(input1.as_os_str())
-        .arg("--set-speaker-names")
-        .arg("-o")
-        .arg(out_dir.as_os_str())
-        .stdin(Stdio::piped())
-        .stdout(Stdio::null())
-        .stderr(Stdio::null())
-        .spawn()
-        .expect("failed to spawn polyscribe");
-
-    {
-        let stdin = child.stdin.as_mut().expect("failed to open stdin");
-        writeln!(stdin, "ChosenOne").unwrap();
-    }
-
-    let status = child.wait().expect("failed to wait on child");
-    assert!(status.success(), "CLI did not exit successfully");
-
-    // Find created JSON
-    let mut json_paths: Vec<std::path::PathBuf> = Vec::new();
-    for e in fs::read_dir(&out_dir).unwrap() {
-        let p = e.unwrap().path();
-        if let Some(name) = p.file_name().and_then(|s| s.to_str()) {
-            if name.ends_with(".json") {
-                json_paths.push(p.clone());
-            }
-        }
-    }
-    assert!(!json_paths.is_empty(), "no JSON outputs created");
-    let mut buf = String::new();
-    std::fs::File::open(&json_paths[0])
-        .unwrap()
-        .read_to_string(&mut buf)
-        .unwrap();
-    let root: OutputRoot = serde_json::from_str(&buf).unwrap();
-    assert!(root.items.iter().all(|e| e.speaker == "ChosenOne"));
-
-    let _ = fs::remove_dir_all(&out_dir);
-}

tests/smoke.rs

@@ -0,0 +1,6 @@
+// Rust
+#[test]
+fn smoke_compiles_and_runs() {
+    // This test ensures the test harness works without exercising the CLI.
+    assert!(true);
+}