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,manifest_hash,feature_id,feature_type,grid_cells,cell_size_m,origin_x_m,origin_y_m,origin_z_m,iso_probe_z_m,exactly_same_as_mc,mean_abs_field_residual_m,max_abs_field_residual_m,triangles,vertices,boundary_edges,nonmanifold_edges,hash
MC,0x8933693d9560ba9f,0x9812c26310b90c9,4,32768,0.25,-172,101,-449.239,-445.239,true,0.212167,16.0068,4496,2345,192,0,0x9d58e0603f1bf9c7
Hybrid,0x8933693d9560ba9f,0x9812c26310b90c9,4,32768,0.25,-172,101,-449.239,-445.239,true,0.212167,16.0068,4496,2345,192,0,0x9d58e0603f1bf9c7
DC,0x8933693d9560ba9f,0x9812c26310b90c9,4,32768,0.25,-172,101,-449.239,-445.239,false,4.57272,16.5898,3961,2247,504,74,0xd9a992278ffa1a64
1 method manifest_hash feature_id feature_type grid_cells cell_size_m origin_x_m origin_y_m origin_z_m iso_probe_z_m exactly_same_as_mc mean_abs_field_residual_m max_abs_field_residual_m triangles vertices boundary_edges nonmanifold_edges hash
2 MC 0x8933693d9560ba9f 0x9812c26310b90c9 4 32768 0.25 -172 101 -449.239 -445.239 true 0.212167 16.0068 4496 2345 192 0 0x9d58e0603f1bf9c7
3 Hybrid 0x8933693d9560ba9f 0x9812c26310b90c9 4 32768 0.25 -172 101 -449.239 -445.239 true 0.212167 16.0068 4496 2345 192 0 0x9d58e0603f1bf9c7
4 DC 0x8933693d9560ba9f 0x9812c26310b90c9 4 32768 0.25 -172 101 -449.239 -445.239 false 4.57272 16.5898 3961 2247 504 74 0xd9a992278ffa1a64