feat(audio): Fix tracker bugs and implement rock demo track

Critical Bug Fixes:
- Fixed pool exhaustion: Tracker slots never freed after use, music stopped
  after 8 patterns. Implemented round-robin allocation with cleanup.
- Fixed note name parsing: Added automatic note-to-frequency conversion
  in tracker_compiler. Bass and melody now play correctly.
- Fixed timing mismatch: Patterns are 2 seconds but triggered every 4 seconds,
  causing silence gaps. Updated SCORE to trigger every 2 seconds.

Improvements:
- Implemented dynamic resource sizing in tracker_compiler: Analyzes score to
  determine optimal MAX_VOICES/MAX_SPECTROGRAMS values.
- Created comprehensive rock track: 11 patterns with drums, bass, power chords,
  and lead melody over 25 seconds.
- Added 213 lines of asset system documentation with 8 prioritized tasks.

Known Issues for next session:
- Audio quality could be improved (some artifacts remain)
- Note synthesis uses default parameters, needs tuning
- Pattern overlaps might cause voice exhaustion under heavy load

Files Changed:
- src/audio/tracker.cc: Round-robin pool allocation, cleanup logic
- tools/tracker_compiler.cc: Note name parser, resource usage analysis
- src/audio/synth.h: Increased limits to 16 based on analysis
- assets/music.track: 230-line rock arrangement
- doc/ASSET_SYSTEM.md: Comprehensive documentation + 8 tasks
- TODO.md: Updated with recent completions and known issues

handoff(Gemini): Music system now functional but needs quality improvements.
Audio artifacts and synthesis tuning remain. See TODO.md for details.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

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