0.9.1 — Full 64-level vertical range

Full Build 42 vertical range: Z=-32..31, with 32 above-ground floors and 32 basements.

• Extended building generation, OSM height/level inference, model authoring, stair access, native previews, lighting and MCP to all 64 signed levels.
• Check actual roof slope height. Keep the highest floor editable with explicit No automatic roof; invalid Z=32 is rejected instead of truncated. Imported roof adaptation remains visible in the quality report.
• Added map/template/world formats 10/7/4 for new vertical authoring while keeping older compatible data readable. Shared template imports support a common bounded 16 MB budget.
• English controls, illustrated documentation and a full 64-level editable/native example, verified by the installed game reader without a game session.

Validation: Core 203/203, JavaScript 138/138, native lighting 23/23 including both extreme levels and invalid bounds, fresh Chromium 64-level authoring/template roundtrip, official MCP clients and native game-reader readback (1,024 chunks, 320 rooms, 189 stair tiles). No character walkthrough is performed. Native lighting visualization retains the documented browser FBO/material/mesh-shadow limitations.