docs: mark Phase 10 complete in PLAN.md

All Phase 10 items now complete:
- ✅ Frequency Analyzer & Spectrogram
- ✅ Phase Correlation Meter
- ✅ LUFS Loudness Meter
- ✅ Audio Statistics with full metrics

Updated status to Phase 11 (Export & Import) in progress.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

PLAN.md

@@ -2,7 +2,7 @@
 
 ## Progress Overview
 
-**Current Status**: Phase 10 Partially Complete (Analysis Tools: Frequency Analyzer & Spectrogram)
+**Current Status**: Phase 10 Complete (Analysis Tools) - Moving to Phase 11 (Export & Import)
 
 ### Completed Phases
 - ✅ **Phase 1**: Project Setup & Core Infrastructure (95% complete)
@@ -136,8 +136,8 @@
 - **Phase 7**: Multi-track editing ✅ COMPLETE (Multi-track playback, effects, selection/editing)
 - **Phase 8**: Recording functionality ✅ COMPLETE (Audio input, controls, settings with overdub/punch)
 - **Phase 9**: Automation ✅ COMPLETE (Volume/Pan automation with write/touch/latch modes)
-- **Phase 10**: Analysis Tools 🔄 IN PROGRESS (Frequency Analyzer & Spectrogram complete, Phase correlation & LUFS remaining)
-- **Phase 11**: Export & Import (NEXT)
+- **Phase 10**: Analysis Tools ✅ COMPLETE (FFT, Spectrogram, Phase Correlation, LUFS, Audio Statistics)
+- **Phase 11**: Export & Import 🔄 IN PROGRESS (WAV complete, MP3/OGG/FLAC remaining)
 
 ---
 
@@ -687,16 +687,17 @@ audio-ui/
 #### 10.3 Metering
 - [x] Peak meter (master and per-track)
 - [x] RMS meter (master and per-track)
-- [ ] Phase correlation meter
-- [ ] Loudness meter (LUFS - optional)
+- [x] Phase correlation meter
+- [x] Loudness meter (LUFS with momentary/short-term/integrated)
 - [x] Clip indicator (master only)
 
 #### 10.4 Audio Statistics
-- [ ] File duration
-- [ ] Sample rate, bit depth, channels
-- [ ] Peak amplitude
-- [ ] RMS level
-- [ ] Dynamic range
+- [x] File duration
+- [x] Sample rate, bit depth, channels
+- [x] Peak amplitude
+- [x] RMS level
+- [x] Dynamic range
+- [x] Headroom calculation
 
 ### Phase 11: Export & Import