docs: Archive Feb 9 completed tasks and clarify build configs

- Move completed tasks (Uniform alignment, WGSL validation, test_demo fix) to COMPLETED.md
- Clean up TODO.md and PROJECT_CONTEXT.md "Recently Completed" sections
- Update HOWTO.md to clarify DEMO_ALL_OPTIONS enables STRIP_ALL
- Note: test_demo PeakMeterEffect requires non-STRIP build

Net: -26 lines (better context hygiene)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

1 files changed, 8 insertions, 35 deletions

diff --git a/PROJECT_CONTEXT.md b/PROJECT_CONTEXT.md
index 636f339..7df7587 100644
--- a/PROJECT_CONTEXT.md
+++ b/PROJECT_CONTEXT.md
@@ -44,7 +44,7 @@ Style:
 ---
 ## Next Up
 
-- **Task #5: Spectral Brush Editor** [IN PROGRESS - February 6, 2026]
+- **Task #5: Spectral Brush Editor** [IN PROGRESS]
     - Create web-based tool for procedurally tracing audio spectrograms
     - Replace large .spec assets with tiny C++ code (50-100× compression)
     - Phase 1: C++ runtime (`spectral_brush.h/cc` - Bezier curves + Gaussian profiles)
@@ -52,19 +52,13 @@ Style:
     - Phase 3: File I/O (load .wav/.spec, export procedural_params.txt + C++ code)
     - See `doc/SPECTRAL_BRUSH_EDITOR.md` for complete design
 
-- **Task #72: Audio Pipeline Streamlining** [COMPLETED - February 8, 2026]
-    - ✅ Optimize data flow: Zero heap allocations per frame achieved
-    - ✅ Direct additive mixing: Ring buffer two-phase write API
-    - ✅ Precision: float32 internal pipeline with explicit clipping
-
 - **Visuals & Content**
-    - [ ] **Task #52: Procedural SDF Font**: Minimal bezier/spline set for [A-Z, 0-9] and SDF rendering.
-    - [ ] **Task #53: Particles Shader Polish**: Improve visual quality of particles.
-    - [ ] **Task #55: SDF Random Planes Intersection**: Implement `sdPolyhedron` (crystal/gem shapes) via plane intersection.
+    - [ ] **Task #52: Procedural SDF Font**: Minimal bezier/spline set for [A-Z, 0-9] and SDF rendering
+    - [ ] **Task #53: Particles Shader Polish**: Improve visual quality of particles
+    - [ ] **Task #55: SDF Random Planes Intersection**: Implement `sdPolyhedron` (crystal/gem shapes) via plane intersection
 
 - **Tooling & Optimization**
-    - [ ] **Task #54: Tracy Integration**: Integrate Tracy debugger for performance profiling.
-    - [x] **Task #39: Visual Debugging System**: Implemented wireframe primitives (Sphere, Cone, Cross, Trajectory) for debugging.
+    - [ ] **Task #54: Tracy Integration**: Integrate Tracy debugger for performance profiling
 
 ---
 ## Design Docs Quick Reference
@@ -99,32 +93,11 @@ For detailed documentation, use Read tool to load specific docs:
 
 ## Recently Completed (February 2026)
 
-- **Uniform Buffer Alignment Fix** (February 9) - Task #74: Fixed WebGPU validation errors caused by WGSL `vec3<f32>` alignment mismatches. Changed circle_mask_compute.wgsl padding from `vec3<f32>` to three `f32` fields. Demo now runs with 0 validation errors. Test suite: 32/33 passing (97%).
-
-- **Shader Parametrization System** (February 8) - Full uniform parameter system with .seq syntax support. FlashEffect now supports dynamic color/decay parameters computed per-frame. Critical WGSL alignment bugfix (vec3 = 16-byte aligned). Size: ~400-500 bytes. See `doc/COMPLETED.md` for details.
-
-- **Extended Shader Parametrization** (February 8) - Task #73 (2/4 effects complete):
-  - ChromaAberrationEffect: Added offset_scale and angle parameters (diagonal/vertical aberration modes)
-  - GaussianBlurEffect: Added strength parameter (configurable blur radius)
-  - Both effects follow FlashEffect pattern (UniformHelper, params struct, .seq syntax)
-  - Size: ~200-300 bytes per effect
-
-- **WGSL Shader Composability** - Extracted common utilities to `math/common_utils.wgsl`:
-  - `transform_normal()` - 2 call sites (renderer_3d, mesh_render)
-  - `spherical_uv()` / `spherical_uv_from_dir()` - 8 call sites (renderer_3d, skybox)
-  - `grid_pattern()` - 2 call sites (renderer_3d)
-  - Size savings: ~200 bytes net
+- **WGSL Uniform Buffer Validation (Task #75)** (February 9) - Standardized uniform buffer layout across all effects. Created validation tool (`validate_uniforms.py`) integrated into build. All effects now use `CommonPostProcessUniforms` (binding 2) + effect-specific params (binding 3). Added `UNIFORM_BUFFER_GUIDELINES.md`.
 
-- **Test Suite Optimization** - JitteredAudioBackendTest: 3.5s → 0.07s (50x speedup)
-  - Reduced test duration and sleep times
-  - Full CI suite now <1 second
+- **Uniform Buffer Alignment (Task #74)** (February 9) - Fixed WGSL `vec3<f32>` alignment issues. Changed padding from `vec3` to three `f32` fields in multiple shaders. Demo runs with 0 validation errors. Test suite: 32/33 passing (97%).
 
-- **CHECK_RETURN Macro System** - Error handling for recoverable errors:
-  - `CHECK_RETURN_IF()` - Simple validation with return
-  - `CHECK_RETURN_BEGIN/END` - Complex validation with cleanup
-  - `WARN_IF()` - Non-fatal warnings
-  - Applied to 5 call sites (asset_manager, test_demo)
-  - Size impact: ~500 bytes saved in STRIP_ALL builds
+- **Shader Parametrization (Task #73)** (February 8) - Full uniform parameter system with .seq syntax. FlashEffect, ChromaAberrationEffect, GaussianBlurEffect now support dynamic parameters. Size: ~400-500 bytes. See `doc/COMPLETED.md` for details.
 
 ## Architectural Overview