wip: cave planner squash-merged into wip/combined (L173, RED - not for main)

Five conflicts resolved (CURRENT-STATE, ResolvedLayoutInternal.h, StreamBenchmarkHeadless.cpp,
StreamBenchmarkPipeline.h, WorldAssemblyPrototype.h) keeping liminal + cave planner; L156 band fit only; evaluator v239
with v239 baselines (18/18 Clang/GCC W1/W8/W12). Fast tier FAILS (FI upper arrival: 40 unsupported chamber samples,
10 chamber-floor shell violations); TN and VS composed sweeps 0/16 (passage, seam, shell gates). Living plane loads at
PostConfigInit (UE smoke passes). Source/: VoxelForgeCoreAdapter.cpp; VoxelForge.uplugin.

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

Standalone/Research/WorldAssemblerM3/Linux150/captures/INDEX.md

@@ -0,0 +1,14 @@
+# L150 matched owner-world captures
+
+Seed 0, with camera poses from the planner layout resolved against the owner's embedded Core plan and reused for both versions. The plan is imported without a seed override. The two Tunnel Network views sit at the planned route and departure joints; the Vertical Shafts views look down from the access landing and up from a ledge.
+
+- Tunnel Network / tunnel-network-route: [assembler-world](assembler-world-tunnel-network-route.jpg) — FAIL
+- Tunnel Network / tunnel-network-departure: [assembler-world](assembler-world-tunnel-network-departure.jpg) — PASS
+- Vertical Shafts / vertical-shafts-looking-down: [assembler-world](assembler-world-vertical-shafts-looking-down.jpg) — FAIL
+- Vertical Shafts / vertical-shafts-looking-up: [assembler-world](assembler-world-vertical-shafts-looking-up.jpg) — FAIL
+- Tunnel Network / tunnel-network-route: [planner-head](planner-head-tunnel-network-route.jpg) — PASS
+- Tunnel Network / tunnel-network-departure: [planner-head](planner-head-tunnel-network-departure.jpg) — PASS
+- Vertical Shafts / vertical-shafts-looking-down: [planner-head](planner-head-vertical-shafts-looking-down.jpg) — PASS
+- Vertical Shafts / vertical-shafts-looking-up: [planner-head](planner-head-vertical-shafts-looking-up.jpg) — PASS
+
+All eight exports and renders completed. The capture-quality gate passed for all four planner-head images and one assembler/world image. Three assembler/world images have insufficient image variance because no mesh surface is visible from those same viewpoints; those gate failures are recorded as the baseline result.