feat(cnn): add CNN v3 directory structure with training dataHEADmain

Initialize CNN v3 subdirectory with training pipeline layout:
- docs/, scripts/, shaders/, src/, tools/, weights/ for organization
- training/input/ with sample images
- training/target_1/, target_2/ for multi-style training
- README.md documenting structure

Training images tracked in repo for easy collaboration.

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

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