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/Source/StreamBenchmarkHeadless.cpp

@@ -49,6 +49,7 @@ namespace
         bool ProfileLodWork=false;
         bool ProfilePassageComposer=false;
         bool InstrumentTileDrain=false;
+        bool ColdWorkerTimeline=false;
         bool Linux77Profile=false;
         bool ExactMidpointDensityMemo=false;
         bool ActiveLaneBatching=false;
@@ -1450,6 +1451,7 @@ namespace
                     "  --audit-uniform-block-proofs (fill and check every interval-certified block)\n"
                     "  --profile-lod-work (report per-LOD density sample counts)\n"
                     "  --instrument-tile-drain (opt-in CpuTileTimeline and per-tile stages/counters)\n"
+                    "  --cold-worker-timeline (record requested/admitted/published tiles and worker idle spans)\n"
                     "  --linux77-profile (Linux-only SIGPROF stack and route census)\n"
                     "  --profile-passage-composer (emit per-tile passage work counters)\n"
                     "  --exact-midpoint-density-memo (exact-input midpoint query memo A/B)\n"
@@ -1509,6 +1511,7 @@ namespace
             else if(arg=="--audit-uniform-block-proofs")options.AuditUniformBlockProofs=true;
             else if(arg=="--profile-lod-work")options.ProfileLodWork=true;
             else if(arg=="--instrument-tile-drain")options.InstrumentTileDrain=true;
+            else if(arg=="--cold-worker-timeline")options.ColdWorkerTimeline=true;
             else if(arg=="--linux77-profile")
             {options.Linux77Profile=true;options.ProfileLodWork=true;}
             else if(arg=="--profile-passage-composer")
@@ -2273,5 +2276,5 @@ int main(int argc,char** argv)
         options.StreamHashAllowUniformSkips,options.Linux77Profile,
         options.StreamingSchedulerPolicy,options.MovingCameraTrace,
         options.MovingCameraSpeedMetersPerSecond,options.MovingCameraDurationSeconds,
-        options.MovingCameraDwellSeconds);
+        options.MovingCameraDwellSeconds,options.ColdWorkerTimeline);
 }