docs: Add Task #68 for mesh wireframe rendering in debug mode

Adds low-priority task to enhance visual debug mode with wireframe overlay
for mesh objects.

**Current State:**
Visual debug mode shows normals for all objects (SDF primitives and meshes)

**Proposed Enhancement:**
Show triangle edges as lines for mesh objects to visualize mesh structure

**Implementation:**
- Extend VisualDebug class with mesh wireframe function
- For each triangle: draw 3 lines connecting vertices (v0→v1, v1→v2, v2→v0)
- Transform vertices to world space using model matrix
- Use distinct color (cyan for edges, yellow for normals)
- Guard with !STRIP_ALL to avoid production overhead

**Use Cases:**
- Verify mesh topology and face orientation
- Debug mesh loading/transformation issues
- Visualize mesh structure alongside SDF primitives
- Check for degenerate triangles or mesh artifacts

**Technical Approach:**
- Access mesh via AssetManager::GetMeshAsset()
- Iterate through indices in groups of 3
- Use existing VisualDebug::draw_line() API
- Transform: world_pos = model_matrix * local_pos

**Priority:** Low (debug visualization only, not production feature)

This complements the existing normal visualization and improves mesh
debugging capabilities.

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

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