docs: update PROJECT_CONTEXT, TODO, COMPLETED for OLA-IDCT

- PROJECT_CONTEXT: audio section reflects OLA-IDCT (Hann, 50% overlap);
  test count 35->34; Next Up notes .spec regen needed
- TODO: remove stale MP3 sub-task (done), trim test TODOs, add .spec
  regen as Priority 3, update test count to 34/34
- COMPLETED: archive OLA-IDCT task with implementation summary

1 files changed, 13 insertions, 26 deletions

diff --git a/TODO.md b/TODO.md
index be4c0e8..c0f8bb1 100644
--- a/TODO.md
+++ b/TODO.md
@@ -21,44 +21,31 @@ Reduce weights from f16 (~3.2 KB) to i8 (~1.6 KB).
 
 ---
 
-## Priority 3: Test Infrastructure Maintenance [ONGOING]
+## Priority 3: Regenerate .spec files as v2 [REQUIRED]
 
-**Status:** 35/35 tests passing
+Existing `.spec` files in `workspaces/main/music/` were encoded with v1 (no overlap).
+Rebuild with the MP3 assets to produce v2 (OLA, Hann, hop=256) — click-free output.
 
-**Outstanding TODOs:**
-
-1. **test_effect_base.cc:250** - [FIXED] Fix SIGTRAP in `test_sequence_render()`
-   - Added `wgpuDeviceTick()` to wait for GPU to finish, resolving the intermittent crash.
-   - All other tests validate the same functionality
-   - Issue: Hangs/crashes during render with external sink view
-
-2. **test_sequence.cc** - Port legacy sequence tests (currently disabled)
-   - Uses legacy Effect/MainSequence system
-   - Lines 168, 173, 182: Re-enable lifecycle and simulation tests after port
+---
 
-3. **test_audio_engine.cc:152** - Re-enable commented test after debugging
+## Priority 4: Test Infrastructure Maintenance [ONGOING]
 
-4. **test_fft.cc:87** - Investigate FFT-DCT algorithm discrepancy
-   - May need different algorithm or fix existing one
+**Status:** 34/34 tests passing
 
+**Outstanding TODOs:**
 
-## Priority 4: Audio System Enhancements [LOW PRIORITY]
+1. **test_sequence.cc** - Port legacy sequence tests (currently disabled)
+   - Lines 168, 173, 182: Re-enable lifecycle and simulation tests after port
 
-Extended audio capabilities for sample assets and procedural synthesis.
+2. **test_audio_engine.cc:152** - Re-enable commented test after debugging
 
-**Sub-tasks:**
+3. **test_fft.cc:87** - Investigate FFT-DCT algorithm discrepancy
 
-1. **MP3 Sample Assets:**
-   - Integrate miniaudio for MP3 decoding
-   - Add ASSET_*.mp3 support to asset_packer
-   - Convert to PCM in AssetManager or synth on load
-   - Use case: Compressed sample libraries
+## Priority 4: Audio System Enhancements [LOW PRIORITY]
 
-2. **GPU-Accelerated PCM Synthesis:**
+1. **GPU-Accelerated PCM Synthesis:**
    - Compute shader for direct PCM generation (bypass spectrogram)
    - Write to compute buffer, readback to synth
-   - Use case: Real-time modulation, complex waveforms
-   - Lower latency than spectrogram path
 
 ---