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2026-03-07refactor(effects): introduce WgslEffect for shader-only post-process effectsskal
Replace boilerplate .h/.cc pairs for simple single-pass effects with a generic WgslEffect base class that takes a shader string + optional WgslEffectParams (binding 3). Port Flash, Passthrough, Heptagon, Scratch, and GaussianBlur to thin header-only wrappers — no .cc files, no CMake entries needed. Removes 5 .cc files (-243 lines). Update EFFECT_WORKFLOW.md, CONTRIBUTING.md, and AI_RULES.md to document the WgslEffect (Path A) vs full class (Path B) workflow. Doc cleanup: fix stale GaussianBlurParams/PostProcessEffect references and test counts. handoff(Claude): WgslEffect landed; 5 effects ported; docs updated. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>