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/Linux156/captures/INDEX.md

@@ -0,0 +1,35 @@
+# L156 matched owner tunnel landing captures
+
+Seed 0 camera poses resolved from the L156 owner layout and reused for both versions. Each view is at eye height at one of the three tunnel landing chambers. Before uses the L151 head build; after uses L156 source stamp `4bf096c0a06f72eb765ff8785d55c00ded946ed1bd1f39fa1914b3658ceb61f0`.
+
+## passage/0-1/0 / upper landing
+
+- Before: [image](before-l151-0-1-0-upper-landing.jpg)
+- After: [image](after-l156-0-1-0-upper-landing.jpg)
+
+## passage/0-1/0 / lower landing
+
+- Before: [image](before-l151-0-1-0-lower-landing.jpg)
+- After: [image](after-l156-0-1-0-lower-landing.jpg)
+
+## passage/1-2/0 / upper landing
+
+- Before: [image](before-l151-1-2-0-upper-landing.jpg)
+- After: [image](after-l156-1-2-0-upper-landing.jpg)
+
+## passage/1-2/0 / lower landing
+
+- Before: [image](before-l151-1-2-0-lower-landing.jpg)
+- After: [image](after-l156-1-2-0-lower-landing.jpg)
+
+## passage/2-3/0 / upper landing
+
+- Before: [image](before-l151-2-3-0-upper-landing.jpg)
+- After: [image](after-l156-2-3-0-upper-landing.jpg)
+
+## passage/2-3/0 / lower landing
+
+- Before: [image](before-l151-2-3-0-lower-landing.jpg)
+- After: [image](after-l156-2-3-0-lower-landing.jpg)
+
+Capture quality failures: 0/12.