Axel Meyer 9a5ef5e832 feat(maps): v3 cells_material field foundation ...

Adds the optional layer.cells_material array to the v3 schema
validator, the per-cell read helper cells_material_at, the
lazy-allocator ensure_cells_material, and extends
cell_has_material plus compute_cell_bitmask_v3 to consult it.

No public-API change yet; cell_has_material's signature gains a
cells_material parameter that all internal callers thread through.
A layer with no cells_material entry remains behaviourally
identical to v0.5.6. Public APIs and the bitmask branch land in
later commits.

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

2026-06-01 21:44:23 +02:00

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