Update docs and help messages for CNN v2 completion

Updated:
- HOWTO.md: Complete pipeline, storage buffer, --validate mode
- TODO.md: Mark CNN v2 complete, add QAT TODO
- PROJECT_CONTEXT.md: Update Effects status
- CNN_V2.md: Mark complete, add storage buffer notes
- train_cnn_v2_full.sh: Add --help message

All documentation now reflects:
- Storage buffer architecture
- Binary weight format
- Live training progress
- Validation-only mode
- 8-bit quantization TODO

1 files changed, 1 insertions, 1 deletions

diff --git a/PROJECT_CONTEXT.md b/PROJECT_CONTEXT.md
index b889b2e..2ed2b09 100644
--- a/PROJECT_CONTEXT.md
+++ b/PROJECT_CONTEXT.md
@@ -36,7 +36,7 @@
 - **Audio:** Sample-accurate sync. Zero heap allocations per frame. Variable tempo. Comprehensive tests.
 - **Shaders:** Parameterized effects (UniformHelper, .seq syntax). Beat-synchronized animation support (`beat_time`, `beat_phase`). Modular WGSL composition.
 - **3D:** Hybrid SDF/rasterization with BVH. Binary scene loader. Blender pipeline.
-- **Effects:** CNN post-processing foundation (3-layer architecture, modular snippets). CNNEffect validated in demo. CNN v2 with parametric static features (7D input: RGBD + UV + sin encoding) ready for training.
+- **Effects:** CNN post-processing foundation (3-layer architecture, modular snippets). CNNEffect validated in demo. CNN v2 complete: storage buffer architecture, binary weights (~3.2 KB), dynamic layer count, patch-based training (100 epochs, 3×3 kernels). TODO: 8-bit quantization.
 - **Tools:** CNN test tool (readback works, output incorrect - under investigation). Texture readback utility functional. Timeline editor (web-based, beat-aligned, audio playback).
 - **Build:** Asset dependency tracking. Size measurement. Hot-reload (debug-only).
 - **Testing:** **36/36 passing (100%)**