wip(assembler): M2 round 2 -- same-LOD borders watertight for MC/hybrid/DC; LOD0/1 transitions still open

Shared halo + deterministic border-quad ownership + T-junction conformance: 625/625 same-LOD for all three.
LOD 2:1 prototype (collar zipper) fails MC 5 / hybrid 38 / DC 40 cases (corners, overhangs).
Hybrid is bit-identical to MC on a sampled native SurfaceWorld cliff; DC rougher. Standalone only.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MmSoF64BbRFmk9C3p1VsBJ
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Fr0zkaandClaude Opus 5.5 committed 2026-10-10 03:56:28 +02:00
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method,phase_x_m,phase_y_m,phase_z_m,contour_expected,unmatched_probes,contour_mean_m,contour_max_m,boundary_edges,nonmanifold_edges,edges_before,nonmanifold_before,transition_triangles,paired_loops,capped_loops,unmatched_loops,transition_surface_max_m,fine_segments,coarse_segments
MC,0.25,0.1,0.1,true,0,0.11871,0.249977,0,0,78,0,234,1,0,0,0.233333,52,26
Hybrid,0.25,0.1,0.1,true,0,0.0929318,0.419411,0,0,82,0,246,1,0,0,0.238888,56,26
DC,0.25,0.1,0.1,true,0,0.0929318,0.419411,0,0,82,0,246,1,0,0,0.238888,56,26
1 method phase_x_m phase_y_m phase_z_m contour_expected unmatched_probes contour_mean_m contour_max_m boundary_edges nonmanifold_edges edges_before nonmanifold_before transition_triangles paired_loops capped_loops unmatched_loops transition_surface_max_m fine_segments coarse_segments
2 MC 0.25 0.1 0.1 true 0 0.11871 0.249977 0 0 78 0 234 1 0 0 0.233333 52 26
3 Hybrid 0.25 0.1 0.1 true 0 0.0929318 0.419411 0 0 82 0 246 1 0 0 0.238888 56 26
4 DC 0.25 0.1 0.1 true 0 0.0929318 0.419411 0 0 82 0 246 1 0 0 0.238888 56 26