036bd530fcd79ffd88af27e619eed4f4e5c4c9f7
L27 added passage support columns, but World::isTileShapeFree only bounded the route and bridge, so tiles touched by a column could be approved for early native-only generation; depending on scheduling they used that incomplete field or the compiled one (six LOD0 tiles differed between W1 and W12 at an SW camera near the arrival mouth). The shape-free proof now includes a conservative envelope for every possible column. The compiled world is unchanged (the old W1 variant), so no version bump. verify tiers gain a seeded (SplitMix64 0x4c3434) random-camera W1/W8/W12 sweep across both recipes and several clip settings; it fails before the fix and passes after. fast/medium/full PASS; cost within noise. Research R11: suspect review. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016dhxM43dnWvUu2B5Ph1iG1
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