- #212: Add GRID_MAX (8192) validation to Grid, ColorLayer, TileLayer
- #213: Validate color components are in 0-255 range
- #214: Add null pointer checks before HeightMap operations
- #216: Change entities_in_radius(x, y, radius) to (pos, radius)
- #217: Fix Entity __repr__ to show actual draw_pos float values
Closes#212, closes#213, closes#214, closes#216, closes#217
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
