wip(assembler): M2 round 1 -- sharp-mesher spike: hybrid MC+DC keeps edges, borders and LOD seams not solved yet

Standalone only. Hybrid/DC cut sharp residual 16.7 -> 6.25 cm and split creases ~100%, organic wall
unchanged under hybrid, +4.4% mesh cost, W1/W8/W16 identical. Gate failed: hybrid open edges on 500/625
tagged tile borders; every method fails LOD0/LOD1 (no transition templates yet). Binaries and OBJ meshes not committed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MmSoF64BbRFmk9C3p1VsBJ

Standalone/Research/WorldAssemblerM2/results/cost.csv

@@ -0,0 +1,46 @@
+piece,method,workers,cell_count,triangles,vertices,mesh_ms_median_3,mesh_hash,collision_proxy_hash,collision_geometry_delta_m
+corner90,MC,1,32768,3192,1598,16.5302,0x3e35202e741326da,0x3e35202e741326da,0
+corner90,MC,8,32768,3192,1598,14.1565,0x3e35202e741326da,0x3e35202e741326da,0
+corner90,MC,16,32768,3192,1598,14.5744,0x3e35202e741326da,0x3e35202e741326da,0
+corner90,Hybrid,1,32768,3196,3473,17.3756,0x1c68ed55a97a2b70,0x1c68ed55a97a2b70,0
+corner90,Hybrid,8,32768,3196,3473,14.7298,0x1c68ed55a97a2b70,0x1c68ed55a97a2b70,0
+corner90,Hybrid,16,32768,3196,3473,15.1832,0x1c68ed55a97a2b70,0x1c68ed55a97a2b70,0
+corner90,DC,1,32768,3196,1875,16.346,0x27eb83e4bcb5d532,0x27eb83e4bcb5d532,0
+corner90,DC,8,32768,3196,1875,13.5541,0x27eb83e4bcb5d532,0x27eb83e4bcb5d532,0
+corner90,DC,16,32768,3196,1875,13.9794,0x27eb83e4bcb5d532,0x27eb83e4bcb5d532,0
+doorway,MC,1,32768,2172,1086,15.0354,0x5091c48df9516232,0x5091c48df9516232,0
+doorway,MC,8,32768,2172,1086,13.7949,0x5091c48df9516232,0x5091c48df9516232,0
+doorway,MC,16,32768,2172,1086,13.9519,0x5091c48df9516232,0x5091c48df9516232,0
+doorway,Hybrid,1,32768,2172,2462,15.8758,0xc70ca49841d4ad46,0xc70ca49841d4ad46,0
+doorway,Hybrid,8,32768,2172,2462,14.137,0xc70ca49841d4ad46,0xc70ca49841d4ad46,0
+doorway,Hybrid,16,32768,2172,2462,14.5053,0xc70ca49841d4ad46,0xc70ca49841d4ad46,0
+doorway,DC,1,32768,2172,1376,15.0068,0x7ec18c54d9af2487,0x7ec18c54d9af2487,0
+doorway,DC,8,32768,2172,1376,13.2934,0x7ec18c54d9af2487,0x7ec18c54d9af2487,0
+doorway,DC,16,32768,2172,1376,13.2488,0x7ec18c54d9af2487,0x7ec18c54d9af2487,0
+riser1m,MC,1,32768,4428,2216,17.6744,0x930603791a29a779,0x930603791a29a779,0
+riser1m,MC,8,32768,4428,2216,15.0862,0x930603791a29a779,0x930603791a29a779,0
+riser1m,MC,16,32768,4428,2216,15.501,0x930603791a29a779,0x930603791a29a779,0
+riser1m,Hybrid,1,32768,4432,4775,19.222,0x7a80c8099ed5e2df,0x7a80c8099ed5e2df,0
+riser1m,Hybrid,8,32768,4432,4775,15.9639,0x7a80c8099ed5e2df,0x7a80c8099ed5e2df,0
+riser1m,Hybrid,16,32768,4432,4775,16.2443,0x7a80c8099ed5e2df,0x7a80c8099ed5e2df,0
+riser1m,DC,1,32768,4432,2559,17.6231,0x7a58ef3dd552662f,0x7a58ef3dd552662f,0
+riser1m,DC,8,32768,4432,2559,15.5117,0x7a58ef3dd552662f,0x7a58ef3dd552662f,0
+riser1m,DC,16,32768,4432,2559,15.5445,0x7a58ef3dd552662f,0x7a58ef3dd552662f,0
+cliff_overhang,MC,1,32768,5036,2520,18.5265,0x1881bd75ddc7e7de,0x1881bd75ddc7e7de,0
+cliff_overhang,MC,8,32768,5036,2520,15.2582,0x1881bd75ddc7e7de,0x1881bd75ddc7e7de,0
+cliff_overhang,MC,16,32768,5036,2520,15.3717,0x1881bd75ddc7e7de,0x1881bd75ddc7e7de,0
+cliff_overhang,Hybrid,1,32768,5040,5412,19.8127,0x985b8497adfe9dec,0x985b8497adfe9dec,0
+cliff_overhang,Hybrid,8,32768,5040,5412,15.9717,0x985b8497adfe9dec,0x985b8497adfe9dec,0
+cliff_overhang,Hybrid,16,32768,5040,5412,16.4467,0x985b8497adfe9dec,0x985b8497adfe9dec,0
+cliff_overhang,DC,1,32768,5040,2892,18.232,0x4723adced541eab2,0x4723adced541eab2,0
+cliff_overhang,DC,8,32768,5040,2892,14.6485,0x4723adced541eab2,0x4723adced541eab2,0
+cliff_overhang,DC,16,32768,5040,2892,14.7275,0x4723adced541eab2,0x4723adced541eab2,0
+organic_cave_chamber,MC,1,32768,2444,1224,13.7729,0x50031a0a691ec6f4,0x50031a0a691ec6f4,0
+organic_cave_chamber,MC,8,32768,2444,1224,13.0782,0x50031a0a691ec6f4,0x50031a0a691ec6f4,0
+organic_cave_chamber,MC,16,32768,2444,1224,13.3739,0x50031a0a691ec6f4,0x50031a0a691ec6f4,0
+organic_cave_chamber,Hybrid,1,32768,2444,1224,14.5881,0x50031a0a691ec6f4,0x50031a0a691ec6f4,0
+organic_cave_chamber,Hybrid,8,32768,2444,1224,13.732,0x50031a0a691ec6f4,0x50031a0a691ec6f4,0
+organic_cave_chamber,Hybrid,16,32768,2444,1224,14.0734,0x50031a0a691ec6f4,0x50031a0a691ec6f4,0
+organic_cave_chamber,DC,1,32768,2448,1226,14.1388,0x317a60749cc26f6a,0x317a60749cc26f6a,0
+organic_cave_chamber,DC,8,32768,2448,1226,12.971,0x317a60749cc26f6a,0x317a60749cc26f6a,0
+organic_cave_chamber,DC,16,32768,2448,1226,13.1444,0x317a60749cc26f6a,0x317a60749cc26f6a,0

Standalone/Research/WorldAssemblerM2/results/determinism.csv

@@ -0,0 +1,46 @@
+piece,method,workers,hash,identical_to_w1
+corner90,MC,1,0x3e35202e741326da,true
+corner90,MC,8,0x3e35202e741326da,true
+corner90,MC,16,0x3e35202e741326da,true
+corner90,Hybrid,1,0x1c68ed55a97a2b70,true
+corner90,Hybrid,8,0x1c68ed55a97a2b70,true
+corner90,Hybrid,16,0x1c68ed55a97a2b70,true
+corner90,DC,1,0x27eb83e4bcb5d532,true
+corner90,DC,8,0x27eb83e4bcb5d532,true
+corner90,DC,16,0x27eb83e4bcb5d532,true
+doorway,MC,1,0x5091c48df9516232,true
+doorway,MC,8,0x5091c48df9516232,true
+doorway,MC,16,0x5091c48df9516232,true
+doorway,Hybrid,1,0xc70ca49841d4ad46,true
+doorway,Hybrid,8,0xc70ca49841d4ad46,true
+doorway,Hybrid,16,0xc70ca49841d4ad46,true
+doorway,DC,1,0x7ec18c54d9af2487,true
+doorway,DC,8,0x7ec18c54d9af2487,true
+doorway,DC,16,0x7ec18c54d9af2487,true
+riser1m,MC,1,0x930603791a29a779,true
+riser1m,MC,8,0x930603791a29a779,true
+riser1m,MC,16,0x930603791a29a779,true
+riser1m,Hybrid,1,0x7a80c8099ed5e2df,true
+riser1m,Hybrid,8,0x7a80c8099ed5e2df,true
+riser1m,Hybrid,16,0x7a80c8099ed5e2df,true
+riser1m,DC,1,0x7a58ef3dd552662f,true
+riser1m,DC,8,0x7a58ef3dd552662f,true
+riser1m,DC,16,0x7a58ef3dd552662f,true
+cliff_overhang,MC,1,0x1881bd75ddc7e7de,true
+cliff_overhang,MC,8,0x1881bd75ddc7e7de,true
+cliff_overhang,MC,16,0x1881bd75ddc7e7de,true
+cliff_overhang,Hybrid,1,0x985b8497adfe9dec,true
+cliff_overhang,Hybrid,8,0x985b8497adfe9dec,true
+cliff_overhang,Hybrid,16,0x985b8497adfe9dec,true
+cliff_overhang,DC,1,0x4723adced541eab2,true
+cliff_overhang,DC,8,0x4723adced541eab2,true
+cliff_overhang,DC,16,0x4723adced541eab2,true
+organic_cave_chamber,MC,1,0x50031a0a691ec6f4,true
+organic_cave_chamber,MC,8,0x50031a0a691ec6f4,true
+organic_cave_chamber,MC,16,0x50031a0a691ec6f4,true
+organic_cave_chamber,Hybrid,1,0x50031a0a691ec6f4,true
+organic_cave_chamber,Hybrid,8,0x50031a0a691ec6f4,true
+organic_cave_chamber,Hybrid,16,0x50031a0a691ec6f4,true
+organic_cave_chamber,DC,1,0x317a60749cc26f6a,true
+organic_cave_chamber,DC,8,0x317a60749cc26f6a,true
+organic_cave_chamber,DC,16,0x317a60749cc26f6a,true