feat(macos): add native desktop controls and hotkey integration

- Introduced MacOsDesktopControlManifest to manage desktop control configurations.
- Implemented MacOsDesktopControlService to handle the lifecycle of the macOS helper process.
- Created MacOsWorkflowRulesEditorWindowService for managing workflow rules through a native window.
- Developed a Swift helper for macOS that integrates with AppKit and Carbon for menu-bar controls and global hotkeys.
- Added support for recording lifecycle actions via HTTP endpoints, maintaining consistency with existing Windows functionality.
- Enhanced user experience by allowing macOS users to start/stop recordings and access settings through a menu-bar interface.
- Documented design decisions, implementation evidence, and verification tasks for the new macOS features.

openspec/changes/add-macos-desktop-controls/tasks.md

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+## 1. Contract and behavior
+
+- [x] 1.1 Define macOS desktop-control requirements and design.
+- [x] 1.2 Add a failing behavior test for configured shortcut and endpoint preservation.
+- [x] 1.3 Implement the desktop-control manifest and make the behavior test pass.
+
+## 2. Native macOS integration
+
+- [x] 2.1 Add and package the native macOS menu-bar/global-hotkey helper.
+- [x] 2.2 Start and stop the helper with the .NET application on macOS.
+- [x] 2.3 Add deterministic helper packaging/self-test coverage.
+
+## 3. Verification and closeout
+
+- [x] 3.1 Run narrow and full tests.
+- [x] 3.2 Run strict OpenSpec validation.
+- [x] 3.3 Launch Meeting Assistant, start a new recording, and save screenshot evidence.
+- [x] 3.4 Perform required DRY, SOLID, and KISS refactoring reviews and re-run verification.