Axel Meyer 89d68d7668 feat(maps): set_cell_material / get_cell_material public APIs ...

Mirrors the existing set_vertex / get_vertex pattern. Bounds and
unknown-layer guards raise the same shape of error as the v3
write-API family. Lazy-allocates layer.cells_material on first
write so maps that never use cell-tile painting stay byte-clean.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-06-01 21:50:56 +02:00

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