wip: Tunnel Network cave planner on Core caves (L134, route support still failing)

Seed + 21/47 legacy fields -> 30 compound rooms (72 primitives), 3 branches, destination chamber; mouths fixed;
8.67 deg max grade. Passage composer no longer skips native cave layers (incoming passage 21,425/21,425 open).
Open: route-support audit has 380 unsupported samples near the arrival mouth. Not for merge.

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

Standalone/Research/WorldAssemblerM3/Linux134/REPORT.md

@@ -0,0 +1,11 @@
+# Linux134 — Tunnel Network cave planner
+
+The second design fixed the incoming passage at its source. Native cave composition already called the shared passage composer, but that composer skipped passages whose lower layer used `hasNativeCaveField`. Removing that skip lets the passage field join the cave field through the boundary and also applies to native lattice layers. Tunnel Network dispatches `Caves-native` (`Core.Caves.PrimitiveField` v1).
+
+The seed-0 plan is strict-valid: 27 route nodes, 72 primitives in 30 compound rooms, 3 branches, 31 edges, and a 6.75 m destination chamber. The route is 387.067 m long with 59.021 m floor delta and 8.670° maximum grade. The passage centerline check now passes 21,425/21,425 samples. All three passage interfaces, shell/floor, ripple, and blocked controls pass.
+
+**Stopped at the Tunnel Network route-support gate.** `ResolvedStrateRouteAudit` reports 0 blocked capsule samples and 0 grade failures, but 380 unsupported samples. The first support failures are just inside the arrival mouth at `(19.166,-14.650,-754.254) m`, then `(19.080,-15.135,-754.327) m` through `(18.909,-16.106,-754.473) m`. Another failing sample cluster starts at `(17.364,-24.839,-755.788) m`. Overall: 795 center samples, 6,957 support probes, `mouth_binding=PASS`, `status=FAIL`. The arrival-to-departure route is therefore not yet walkable under the support audit. I stopped before the remaining bar.
+
+The planner maps 21/47 legacy fields into room/edge records: `RoomSpacing`, `RoomDensity`, `MinRoomRadius`, `MaxRoomRadius`, `RoomHeightRatio`, `RoomFloorCutMin`, `RoomFloorCutMax`, `RoomShapeVariety`, `OriginRoomRadius`, `OriginRoomMaxConnections`, `TunnelMinRadius`, `TunnelMaxRadius`, `TunnelDensity`, `MaxTunnelLength`, `TunnelWarpStrength`, `TunnelHorizontalBias`, `bTunnelsFlowTowardOrigin`, `CaveWarpStrength`, `SurfaceRoughness`, `RoughnessFrequency`, and `SDFBlendRadius`. The other 26 do not map: `BaseDensity`, `BoundarySealThickness`, `CaveWarpFrequency`, `DomainWarpFrequency`, `DomainWarpStrength`, `FloorBias`, `FloorReliefFrequency`, `FloorReliefStrength`, `RoomMouthRiseBlendVoxels`, `RoomMouthRiseStrength`, `TunnelEndpointZOffset`, `TunnelFloorGentleSlopeThreshold`, `TunnelFloorLedgeCountPreference`, `TunnelFloorMaxLedgeHeight`, `TunnelFloorMaxLedges`, `TunnelFloorTerraceStepHeight`, `VerticalScale`, `WaterLevelRelative`, `WormFrequency`, `WormHorizontalBias`, `WormNetworkRange`, `WormStrength`, `WormThreshold`, `bTunnelFloorEnabled`, `bTunnelFloorTerracingEnabled`, and `RoughnessNoiseType`.
+
+Clang headless build passed (source stamp `e2cf59ad7ff10c1650c0f1cc5b99dab1c53439d128c9f263eb9848b3882723f5`). No GCC build, baselines, determinism matrix, captures, seams/fast tier, timing, or UE host build were run after the route-support failure. Logs: `Saved/Linux/l134/build-clang-second-design.log` and `Saved/Linux/l134/walk-gate-second-design.log`.