feat(core): cavern graph v1, one continuous floor-capped tunnel into the landmark chamber (L46); R13

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The flagged SW demo's ramp (57 carves + 107 support pillars, visibly ribbed) becomes one cubic-Bezier
sweep: closest point by 17-point seed plus 5 Newton steps, a cubic floor profile, a rounded 2.6 m bore,
and a hard floor cap applied after unions and relief that only adds support where the field is air.
Optional resolved cavern-graph records (one room, one edge) enter canonical identity only when present;
their bounds extend World::isTileShapeFree. Reachability passes (L43 control fails), headroom 2.8 m,
floor ripple 1.8 mm (L45 ramp control fails at 17.9 mm), shape limits met; demo off: owner hashes
identical to L45. fast/medium/full PASS. Research R13 (read-only): continuous SDF sweeps along curves.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016dhxM43dnWvUu2B5Ph1iG1

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Fr0zkaandClaude Opus 5.5 committed 2026-10-24 09:53:06 +02:00

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Standalone/Research/WorldAssemblerM3/Linux46/captures/overview-entrance-and-chamber.jpg

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