## 1. macOS Capture Behavior

- [x] 1.1 Specify macOS microphone and computer-output capture behavior and Windows isolation.
- [x] 1.2 Add failing behavior tests for macOS PCM streaming, platform registration, and the public recording endpoints.
- [x] 1.3 Implement the managed macOS audio-source and process-lifetime adapter.
- [x] 1.4 Implement and package the AVFoundation/ScreenCaptureKit Swift helper.
- [x] 1.5 Register the macOS composite source without changing the Windows registration path.

## 2. Verification and Documentation

- [x] 2.1 Document macOS permissions, build packaging, and recording behavior.
- [x] 2.2 Capture and inspect a short example mixed WAV through the new implementation.
- [x] 2.3 Run focused tests, portable tests/build, Windows-target regression compilation, strict OpenSpec validation, and refactoring/code review.