feat(macos): add tray lifecycle primitives

[birdmanmandbir]

Summary

• add a native NSStatusItem/NSMenu binding with stable item IDs and explicit callback teardown
• add opt-in close-to-hide windows, terminal programmatic close, and first-eligible Dock reopen
• keep the runtime alive when its last window is close-to-hide; preserve normal last-window termination otherwise
• publish a synchronous pre-Bare-teardown notification for native callback owners
• preserve exact UTF-8 lengths at the Objective-C bridge and reject NUL-bearing menu strings before mutation
• add AppKit CTests and a test-only addon that proves exactly-once deletion of real JS references
• keep native C fixture assertions active in Release builds

Verification

• npm test: 5 tests, 16 assertions
• npm run test:native-lifecycle
• clean Darwin arm64 all-target build
• explicit bare_runtime target build
• CTest: window_lifecycle and status_item_lifecycle, with Release assertions enabled
• source-scoped Prettier and lunte
• production addon contains no testing hooks