- Add GET /api/simulator/gdop/heatmap endpoint in both simulator handlers
- Fix viz3d.js to call correct endpoint (GET instead of POST)
- Update response format handling to parse gdop_map and grid_dimensions
- Generate colors from GDOP values using quality thresholds
- Position overlay correctly in 3D scene
The GDOP overlay now visualizes accuracy metrics across the virtual space
with color-coded quality indicators (green=excellent, yellow=good, orange=fair, red=poor).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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