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2026-03-06feat(effects): add Scratch post-process effect with reusable scratch_lines ↵skal
snippet - src/shaders/render/scratch_lines.wgsl: reusable WGSL snippet registered as "render/scratch_lines"; call scratch_lines(uv, resolution, time)->f32 from any effect. Uses hash_1f from math/noise; 8 lines/frame, ~24fps flicker. - src/effects/scratch.{wgsl,h,cc}: thin Scratch effect wrapping the snippet. - Applied to "intro" and "rotating_cube" sequences as the final step. - 35/35 tests passing. handoff(Gemini): Scratch effect added. render/scratch_lines snippet is reusable. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-02-28refactor: move common/shaders/ to src/shaders/skal
Relocates shared WGSL shaders under src/ where all source code lives, eliminating the top-level common/ directory. - Update asset references in workspaces/main/assets.txt and workspaces/test/assets.txt - Update docs: PROJECT_CONTEXT.md, ARCHITECTURE.md, WORKSPACE_SYSTEM.md, SHADER_REUSE_INVESTIGATION.md Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>