[feat] add example scripts for transcription, model downloading, and updates; improve documentation with guides for CI, packaging, and development

docs/ci.md

@@ -0,0 +1,26 @@
+# 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.