Issue #295 calls out that core Rust paths have been too dependent on manual app runs. Keep the change narrow by covering existing pure state/audio/clipboard helpers instead of refactoring coordinator or touching hardware-facing code, then wire the existing lib test suite into the lightweight CI lane.
Constraint: Global hotkey, recorder, and insertion integration still require real OS permissions and devices.
Rejected: Split coordinator before adding tests | broader refactor would raise review risk and is tracked separately.
Confidence: high
Scope-risk: narrow
Directive: Keep Rust CI on --lib unless integration tests get explicit OS fixtures.
Tested: npm run build
Tested: cargo test --manifest-path src-tauri/Cargo.toml --lib
Tested: cargo check --manifest-path src-tauri/Cargo.toml
Not-tested: Live microphone, global hotkey, clipboard, and insertion device paths.
Related: #295
H-Chris233
88e8418982