diag: corrected passage-off ceiling + cold worker/tile timelines (L87); passages ARE the gate

L86's switch left ApplyResolvedStratePassageCarves running (near-tile service unchanged at ~21
worker-s), so its "no change" ceiling was wrong. Corrected (bands + carves off): FI LOD0-2
2.34 -> 0.66 s, whole 3.47 -> 1.49 s @W12; TN 2.27 -> 0.74 / 3.28 -> 1.52 s. Near-tile service
15.6-22.5 -> 2.6-3.8 worker-s. Critical chain: shape/base compile -> LOD0-1 -> far-parent build
(107-153 ms, pipeline thread) -> LOD2. Workers 81-85% busy in the direct window.
No production scheduling change; hashes equal L85. Fast tier PASS.

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

Standalone/Core/src/ShapeWorldInternal.h

@@ -2255,8 +2255,10 @@ public:
         // the generic stratum transition distance creates a discontinuity at a
         // mouth that crosses a wide transition band. Keep that opt-in field whole;
         // its host-rock value already supplies the ceiling and bedrock.
+        const bool disablePassageComposition=!nativeLattice
+            &&VF_IsL86PassageCompositionDisabled();
         float boundary=graphDensity;
-        if(!nativeLattice && !VF_IsL86PassageCompositionDisabled())
+        if(!nativeLattice&&!disablePassageComposition)
         {
             VoxelForgeCore::Linux77Profiler::FScopedPhase l77BandsPhase(
                 VoxelForgeCore::Linux77Profiler::EPhase::Bands);
@@ -2267,7 +2269,7 @@ public:
         // supported spine. Reapplying legacy passage carves here can erase the
         // tread immediately above a broad legacy mouth or support column.
         float composed=boundary;
-        if(!nativeLattice)
+        if(!nativeLattice&&!disablePassageComposition)
         {
             VoxelForgeCore::Linux77Profiler::FScopedPhase l77PassagePhase(
                 VoxelForgeCore::Linux77Profiler::EPhase::Passage);