Drop unused AppleEvents usage string; de-stale Phase-N comments

The NSAppleEventsUsageDescription usage string was dead — the app has no AppleEvents/AppleScript code path (Meet detection reads window titles), so the permission prompt never fired; remove it. Rephrase the leftover "Phase N" build-plan references in source comments (one of which falsely claimed "no audio, capture, or call detection yet"), and complete the AGENTS.md Audio/Detection layout listings.

Ten31Transcripts/Audio/AudioRecorder.swift

@@ -14,7 +14,7 @@ struct RecordingResult {
     let systemNote: String?
 }
 
-/// Dual-track local audio capture for Phase 1.
+/// Dual-track local audio capture.
 ///
 /// - System audio via `SCStream` (`capturesAudio`); its audio handler runs on
 ///   `ioQueue`. A discard-only video output runs on `screenQueue` purely to keep

Ten31Transcripts/Audio/MicVAD.swift

@@ -13,8 +13,8 @@ struct VADSpan: Equatable {
 /// internal sample cursor always equals the mic file position, and span times
 /// land on the same instants as `mixed_mono_16k.wav`.
 ///
-/// Phase 3's `TimelineBuilder` will fold these in as high-confidence pre-seeded
-/// "self" segments. Thresholds are intentionally simple and will be tuned later.
+/// `TimelineBuilder` folds these in as high-confidence pre-seeded "self"
+/// segments. Thresholds are intentionally simple.
 ///
 /// Single-threaded: all calls happen on `AudioRecorder.ioQueue`.
 final class MicVAD {