[feat] implement backend abstraction, dynamic backend selection, and GPU feature integration

plugins/polyscribe-plugin-tubescribe/Cargo.toml

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+[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

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+# 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

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+// SPDX-License-Identifier: MIT
+// Stub plugin: tubescribe
+
+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(());
+    }
+    // Default: show capabilities (friendly behavior if run without flags)
+    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<()> {
+    // Read exactly one line (one request)
+    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")?;
+
+    // Simulate doing some work with progress
+    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())))?;
+
+    // Handle method and produce result
+    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 => {
+            // Unknown method
+            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(())
+}