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@@ -29,6 +29,15 @@ Detailed historical documents have been moved to `doc/archive/` for reference:
Use `read @doc/archive/FILENAME.md` to access archived documents.
+## Recently Completed (March 2026)
+
+- [x] **Scratch post-process effect**
+ - New `Scratch` effect overlays random horizontal film-scratch lines additively on top of any input buffer.
+ - Scratch logic extracted into reusable snippet `src/shaders/render/scratch_lines.wgsl` (registered as `"render/scratch_lines"`). Any effect can `#include "render/scratch_lines"` and call `scratch_lines(uv, resolution, time) -> f32`. Uses `hash_1f` from `math/noise`.
+ - Applied to first two timeline sequences ("intro", "rotating_cube") as the final post-process step.
+ - **Files:** `src/shaders/render/scratch_lines.wgsl` (new), `src/effects/scratch.wgsl` (new), `src/effects/scratch_effect.{h,cc}` (new), `assets.txt`, `DemoSourceLists.cmake`, `demo_effects.h`, `shaders.{h,cc}`, `test_demo_effects.cc`, `timeline.seq`
+ - **Tests:** 35/35 passing
+
## Recently Completed (March 2, 2026)
- [x] **OLA-IDCT Synthesis — click-free .spec decoding**