wip(assembler): round S6 -- in-game cold view counted; workers mostly idle, apply cap not the floor

Direct per-tile trace on the BuildHost actor (owner plan, 2,578 keys): full set
17.4 s legacy; gated coarse-first (after the 9-tile walkable ring) 11.7 s with
the ring still at 0.63 s, but full LOD0 slips 2.3 -> 10.2 s. Startup apply
boost changed nothing (0.4%). 37.6 worker-s over 17.4 s on 10 slots = ~3.3
busy: the floor is admission/work supply. S5's 251 ms staircase was the trace
sampler. Fixed CVar parsing in headless BeginPlay and the 60 m/s crossing
instrument. All three knobs stay opt-in.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MmSoF64BbRFmk9C3p1VsBJ

CODEMAP.md

@@ -996,6 +996,20 @@ exact-density-root LOD7/8 agreement audit with its datum-offset negative control
 ARCHITECTURE §8.25 and
 [`Standalone/Research/WorldAssemblerM3/Round8/REPORT.md`](Standalone/Research/WorldAssemblerM3/Round8/REPORT.md).
 
+### 3.14 Cold streaming apply trace and gated coarse order — World Assembler S6 / M3 Round 10
+
+`AVoxelWorld::ProcessPendingChunks` records per-frame result draining, visible-mesh applies, the
+authored/startup budgets, per-LOD apply counts and worker occupancy through
+`VoxelStartupTrace::RecordApplyFrame`. Direct `tile` events separate request-to-worker queue,
+generation work, worker-result queue and game-thread apply time; `collision_ready` records the
+RealtimeMesh body-update latency. `AVoxelWorld::UpdateChunksAroundPosition` samples resident counts
+every 250 ms (for observation only) and admits coarse-first work only after the required nine-tile
+walkable ring is ready. The order and startup apply boost are opt-in CVars; the boost is default-off.
+`VoxelForgeExploreCommandlet.cpp` drives the staged owner-plan trace and moving actor check. The
+standalone viewer's 60 m/s crossing counter now accepts multi-chunk forward deltas. See
+ARCHITECTURE §8.27 and
+[`Standalone/Research/WorldAssemblerM3/Round10/REPORT.md`](Standalone/Research/WorldAssemblerM3/Round10/REPORT.md).
+
 ## 4. The density pipeline (most-edited hot path)
 
 ### 4.1 `GetDensityWithParams` (TunnelNetwork) — VoxelGenerator.cpp:3749