Sprite-mode in draw_map:
- tilemap-tiles with texture atlas-id render via
engine.render.draw_sprite_transform with rotation pivot at tile center
- tiles without texture continue to render via draw_rect with color
(Phase 1 mode preserved)
Tile rotation:
- maps support an optional tile_rotations parallel array in the map
JSON with per-cell 90-degree rotation values (0/90/180/270)
- absent or nil entries default to 0 (no rotation)
- enables 9-segment tile reuse via rotation rather than per-orientation
sprites
New API:
- maps.load_textures(asset_aliases) resolves the current tilemap's
tile atlas-ids to texture-handles via the asset-lib indirection
(asset_aliases[tilemap.asset_pack] -> lib-id -> atlas.json lookup
per tile)
Schema additions:
- tilemap.asset_pack (alias-key, optional)
- tile.texture (atlas-id, optional)
- map.tile_rotations (parallel array, optional)
All existing Phase 1 color-only tilemaps render unchanged.
