CNN v2 documentation update - Phase 5 complete

Updated project status to reflect CNN v2 implementation completion.

Changes:
- TODO.md: Marked Task #85 as [READY FOR TRAINING]
  - All 5 phases complete
  - Infrastructure ready for model training and integration
- PROJECT_CONTEXT.md: Updated Effects section
  - Added CNN v2 parametric static features reference
  - Added CNN_V2.md to technical documentation list

Status summary:
✅ Phase 1: Static features shader (8×f16 packed, 3 mip levels)
✅ Phase 2: C++ effect class (CNNv2Effect)
✅ Phase 3: Training pipeline (train_cnn_v2.py, export)
✅ Phase 4: Validation tooling (validate_cnn_v2.sh)
✅ Phase 5: Render pipeline (compute passes, bind groups)

Next steps: Train model, generate layer shaders, demo integration

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

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