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Implement C++ runtime foundation for procedural audio tracing tool.
Changes:
- Created spectral_brush.h/cc with core API
- Linear Bezier interpolation
- Vertical profile evaluation (Gaussian, Decaying Sinusoid, Noise)
- draw_bezier_curve() for spectrogram rendering
- Home-brew deterministic RNG for noise profile
- Added comprehensive unit tests (test_spectral_brush.cc)
- Tests Bezier interpolation, profiles, edge cases
- Tests full spectrogram rendering pipeline
- All 9 tests pass
- Integrated into CMake build system
- Fixed test_assets.cc include (asset_manager_utils.h)
Design:
- Spectral Brush = Central Curve (Bezier) + Vertical Profile
- Enables 50-100x compression (5KB .spec to 100 bytes C++ code)
- Future: Cubic Bezier, composite profiles, multi-dimensional curves
Documentation:
- Added doc/SPECTRAL_BRUSH_EDITOR.md (complete architecture)
- Updated TODO.md with Phase 1-4 implementation plan
- Updated PROJECT_CONTEXT.md to mark Task #5 in progress
Test results: 21/21 tests pass (100%)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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