tools(audit): whole-surface mesh artifact audit with historical controls (L48, tool only); research R15

AuditWholeSurfaceL48.py scans every LOD0 triangle in the route corridor + 3 m and the chamber box + 3 m:
welded-edge normal variation, high-angle edge density, max jumps and sliver area in 1 m cells, clustered
and located, with thresholds from native patches in the same export, plus a detrended full-width floor
profile. L45 ramp, L46 entrance and L47 wall-foot meshes fail it; plain native terrain passes. Red-triangle
SVG maps included. Not wired into the tiers yet; the attempted Core fix is parked on wip/l48-surface-audit.
Research R15: mesh artifact metrics.

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 14:53:11 +02:00
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