feat: add NVIDIA Parakeet TDT v3 as alternative ASR engine#51
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…gine Introduce `TranscribingEngine` protocol to abstract ASR backends, allowing users to switch between WhisperKit and Parakeet in Settings. Parakeet runs via FluidAudio CoreML (~50 MB model, ~10× faster than Whisper Large v3, 25 European languages). - Add `TranscribingEngine` protocol with `mergeDualSourceSegments` default impl - Add `ParakeetEngine` wrapping FluidAudio's `AsrManager`/`AsrModels` - Conform `WhisperKitEngine` to protocol, move merge logic to extension - Add `TranscriptionEngineSetting` enum + engine picker in SettingsView - Wire `activeTranscriptionEngine` through AppState → PipelineQueue - Auto-load selected engine model on app launch - Update 559 tests (0 failures) Closes #47
- ParakeetEngineTests (13): initial state, protocol conformance, merge, dedup - TranscribingEngineTests (14): mergeDualSourceSegments labels, sorting, delay, empty inputs - ParakeetE2ETests (6): model load, transcription with fixture, German content - AppStateTests +5: engine switching (activeTranscriptionEngine, pipeline wiring) Total: 559 → 597 tests, 0 failures
- Add TranscribingEngine protocol and ParakeetEngine to project structure - Update pipeline diagrams to show [WhisperKit | Parakeet] engine selection - Add engine comparison table (languages, model size, speed) - Update recording pipeline to reflect 16kHz capture-time normalization - Update test counts (597)
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Summary
TranscribingEngineprotocol to abstract ASR backends (WhisperKit, Parakeet)ParakeetEnginewrapping FluidAudio's CoreML-based Parakeet TDT v3 (~50 MB model, ~10× faster than Whisper Large v3, 25 European languages)Test plan
ParakeetEngineTests(13 unit tests: state, conformance, merge, dedup)TranscribingEngineTests(14 tests: mergeDualSourceSegments protocol extension)ParakeetE2ETests(6 tests: model load, transcription, German content)AppStateTests+5 engine switching testsCloses #47