feat(physics): Implement SDF-based physics engine and BVH

Completed Task #49.
- Implemented CPU-side SDF library (sphere, box, torus, plane).
- Implemented Dynamic BVH construction (rebuilt every frame).
- Implemented PhysicsSystem with semi-implicit Euler integration and collision resolution.
- Added visual debugging for BVH nodes.
- Created test_3d_physics interactive test and test_physics unit tests.
- Updated project docs and triaged new tasks.

1 files changed, 8 insertions, 0 deletions

diff --git a/PROJECT_CONTEXT.md b/PROJECT_CONTEXT.md
index 31045ce..b2c94c0 100644
--- a/PROJECT_CONTEXT.md
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@@ -80,10 +80,18 @@ Style:
     - [ ] **Task #49.3: Physics Loop**: Implement integration, narrow-phase SDF probing, and collision resolution.
 
 - **Task #18: 3D System Enhancements**
+    - [ ] **Task #18.0: Basic OBJ Asset Pipeline**: Implement `ASSET_MESH` type, `asset_packer` OBJ support, and `Renderer3D` mesh rendering.
     - [ ] **Task #36: Blender Exporter**: Create script to export scenes to internal binary format.
     - [ ] **Task #37: Asset Ingestion**: Update `asset_packer` to handle the new 3D binary format.
     - [ ] **Task #38: Runtime Loader**: Implement a minimal C++ parser to load the scene data into the ECS/Renderer.
 
+- **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.
+
+- **Tooling & Optimization**
+    - [ ] **Task #54: Tracy Integration**: Integrate Tracy debugger for performance profiling.
+
 ---
 ## Future Goals
 - **Task #5: Implement Spectrogram Editor**