docs: Update documentation for shader parametrization progress

- Updated TODO.md: Task #73 marked as 2/4 complete
- Updated PROJECT_CONTEXT.md: Added ChromaAberration and GaussianBlur completions
- Noted remaining effects: DistortEffect, SolarizeEffect

1 files changed, 5 insertions, 1 deletions

diff --git a/TODO.md b/TODO.md
index 0d789e3..8b9ac82 100644
--- a/TODO.md
+++ b/TODO.md
@@ -7,6 +7,8 @@ This file tracks prioritized tasks with detailed attack plans.
 ## Recently Completed (February 8, 2026)
 
 - [x] **Shader Parametrization System**: Full uniform parameter system with .seq syntax support. FlashEffect now supports color/decay parameters with per-frame animation. See `COMPLETED.md` for details.
+- [x] **ChromaAberrationEffect Parametrization**: Added offset_scale and angle parameters. Supports diagonal and vertical aberration modes via .seq syntax.
+- [x] **GaussianBlurEffect Parametrization**: Added strength parameter. Replaces hardcoded blur radius with configurable value.
 
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@@ -256,9 +258,11 @@ This file tracks prioritized tasks with detailed attack plans.
   - **Priority**: Low (current workflow acceptable, but nice-to-have for rapid iteration)
 
 ### Visual Effects
-- [ ] **Task #73: Extend Shader Parametrization**: Apply parametrization system to other effects
+- [ ] **Task #73: Extend Shader Parametrization** [IN PROGRESS - 2/4 complete]
   - **Goal**: Extend uniform parameter system to ChromaAberrationEffect, GaussianBlurEffect, DistortEffect, SolarizeEffect
   - **Pattern**: Follow FlashEffect implementation (UniformHelper, params struct, .seq syntax)
+  - **Completed**: ChromaAberrationEffect (offset_scale, angle), GaussianBlurEffect (strength)
+  - **Remaining**: DistortEffect, SolarizeEffect
   - **Priority**: Medium (quality-of-life improvement for artists)
   - **Estimated Impact**: ~200-300 bytes per effect
 - [ ] **Task #52: Procedural SDF Font**: Minimal bezier/spline set for [A-Z, 0-9] and SDF rendering.