wip(assembler): round S7 -- workers kept busy: in-game cold full view 17.5 s -> 7.8 s

Two admission blockers found by per-frame decline codes: the near reserve held
four slots idle after LOD0 was done (coarse capped at 6), and finished-but-
unapplied results counted against the task cap. Admission now counts queued +
running tasks; near reserve releases once the walkable ring is ready while
stationary (voxel.StreamingDynamicNearReserve, default on). Walkable ring
0.65 -> 0.58 s, full LOD0 2.28 -> 1.44 s, busy workers 2.2 -> 5.6 of 10.
Old behaviour behind voxel.StreamingLegacyPendingResultCap. RMC source reviewed
(read-only): batching/fast-cook ranked, not yet worth it on measured apply cost.

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

CODEMAP.md

@@ -370,7 +370,7 @@ casse cette arithmetique *structurellement* — `BeginPlay` loggue une **Error**
 | `RecordTileHash` / `WriteTileHashDump` | — | Headless `-voxel.TileHashDump=<absolute path>` parity instrument. Records the exact `FVoxelMeshData` used by the streaming result, including empty/classified tiles, then writes sorted absolute tile keys, LOD step/cells, content-band limits, settings digest context, and the shared `VoxelGeometryHash` at `EndPlay`. |
 | `SyncRemeshTile` | — | **INSTANT DIG**: level-0 same-frame re-mesh on the game thread. Uses `PreEditDensityCache` when the tile is resident in the bounded local cache, replays the current DiffLayer over that exact procedural lattice, then meshes/applies inline so a carve is visible THIS frame. A cache miss uses normal generation; it captures the unedited lattice if the tile needs meshing, while uniform-tile proofs remain enabled. |
 | `PreEditDensityCache` / `VoxelForgePreEditDensityCache::BuildEditedGrid` | — | Per-world cache of the pawn's current L0 tile: exact 35³ pre-edit samples, max **171,500 bytes**. It is pruned when the pawn crosses chunk boundaries and cleared on `RegenerateAllChunks`. `BuildEditedGrid` snapshots touched diff chunks once and reproduces `GetDensityAt`'s final `pre-edit - EvaluateMods` operation before the per-call shared-grid mesher path. |
-| `UpdateChunksAroundPosition` | 8603 | Shared Core/legacy scheduler. Builds the desired set and delta-culls leavers; admits the occupied/support tile plus collision-required LOD0 tiles in the pawn's 3×3 XY ring as `CollisionCritical`. S5 coarse-first admission is opt-in (`voxel.StreamingCoarseFirst=1`): it submits remaining coarse levels from max LOD down through `max(2, FullResClipLevels)`, then LOD0/1 refinement; ties favor travel direction, then distance. Default `0` preserves S4's LOD0-to-LOD8 order. `voxel.StreamingDynamicNearReserve=1` opts into holding the authored near-worker reserve while moving or until the stationary walkable ring is ready; default `0`. The clipmap stays non-overlapping and existing load-before-unload / `TransitionHold` reconciliation remains authoritative; S5 adds no overlapping placeholder layer. Standalone defaults to legacy; use `--coarse-first-stream-order` to opt in. §8.10 + §8.26. |
+| `UpdateChunksAroundPosition` / `GetGenerationAdmissionCount` | 10990 / 10971 | Shared Core/legacy scheduler. Builds the desired set and delta-culls leavers; admits the occupied/support tile plus collision-required LOD0 tiles in the pawn's 3×3 XY ring as `CollisionCritical`. S5 coarse-first admission stays opt-in (`voxel.StreamingCoarseFirst=1`). `voxel.StreamingDynamicNearReserve=1` is now the default: it keeps the authored near reserve while moving or until the stationary walkable ring is ready, then makes those slots available to coarse work. Admission counts submitted queued/running tasks, not completed results waiting in the MPSC result queues; `voxel.StreamingLegacyPendingResultCap=1` restores the old `PendingTiles`-based cap for the negative control. `PendingTiles` still lasts through game-thread apply for duplicate suppression and result bookkeeping. The clipmap stays non-overlapping and load-before-unload / `TransitionHold` reconciliation remains authoritative. Standalone has no mirror of this actor scheduler. §8.10 + §8.26–8.28. |
 | `AdvanceHeadlessCollisionGateStressTest` / `ObserveHeadlessCollisionGateStressTest` / `MaybeFinishHeadlessCollisionGateStressTest` / `MeasureHeadlessCollisionGateStressTerrain` | — | Explicit `-voxel.TestCollisionGateStress=1` harness only. The normal spawn-height cvar offsets from the measured density surface; `voxel.TestCollisionGateStressDeepDrop=1` carves a process-local box shaft from above the top to just above the floor tile, extending along the post-landing route so the pawn does not run into the shaft sidewall, temporarily raises only the transient test DiffLayer brush-radius allowance for that fixture, removes only the local pawn's redundant streaming anchor for this isolated repro, proves every sample in two complete outside-ring level-0 tiles is air before seeding their known-empty status, prewarms the known-empty in-ring column, and asserts that the support walk reaches the in-layout floor outside the aligned level-0 render ring before the pawn drops. The log reports whether the fixed gate retains that otherwise out-of-ring target. Other streaming anchors remain active. The fixture rejects a target or floor outside the layout, a non-air empty-tile proof, or a floor inside the aligned level-0 ring. The `GetDensityAt` column at capsule feet defines the local air/solid surface; the deep-drop column crossing is cached after its first exact scan. Each frame records actor position, velocity, direct foot tile and gate support readiness, gate state, signed feet clearance, and a ≤0.5-voxel sweep between positions. PASS requires no measured clearance below −5 cm; deep-drop gate-on also requires horizontal travel during a hold. Result logs include the terminal density column, first crossing below spawn height, hold count/time, and gated horizontal progress. |
 | `BuildDesiredTiles` | 6482 | Builds `DesiredSorted`+`DesiredStamped` (player clipmap shells), then adds streaming anchors and the pending player's collision-only support column before the leaver sweep. It orders from the true local pawn position and builds `CriticalDesiredTiles` for the unresolved support target, occupied/support and heading tiles. Also rebuilds `DesiredTransitionDescendants` (ancestor → desired descendants, including face/edge-touching replacements) for the reconcile pass. |
 | `CollisionGateDesiredTiles` / `RequestCollisionGateSupportTile` | 5062 | Retains an unresolved support target and up to three level-0 tiles below it across desired-set rebuilds. The additional keys are hidden collision-only tiles, queued ahead of ordinary streaming, and pruned once resolved or outside the active column. |
@@ -996,19 +996,25 @@ 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
+### 3.14 Cold streaming admission and apply trace — World Assembler S7 / M3 Round 11
 
-`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).
+`AVoxelWorld::UpdateChunksAroundPosition` writes a `scheduler_admission` record on each submission
+pass, plus `scheduler_skip` for core-readiness bypasses and all-loaded latches that still have missing
+work. The admission record includes desired/missing/pending keys by LOD, task caps, submitted attempts,
+stop level, decline reason, `bCoreRegionCompilePending`, pending-result estimate, and cumulative
+worker-task time. Rule codes are 1=full task cap, 2=near reserve, 3=all-loaded latch, 4=inner
+`LoadTile`/`LoadCoreTile` rejection, and 5=desired work still missing with apparent capacity.
+This is the trace used to separate the
+old near-reserve stop from completed-but-unapplied results counted as active. The default admission
+count uses queued/running `ActiveTaskCount`; `voxel.StreamingLegacyPendingResultCap=1` restores the
+old pending-result cap. The negative-control harness sets that together with
+`voxel.StreamingDynamicNearReserve=0`. `ProcessPendingChunks` still records result draining,
+visible-mesh applies, per-LOD counts and budget use; direct `tile` events separate worker queue,
+task time, result queue and game-thread apply. `collision_ready` records RealtimeMesh submit-to-body
+update latency. The per-frame `running_workers` sample aliases short task bursts, so use the
+cumulative task intervals for worker-seconds. `VoxelForgeExploreCommandlet.cpp` drives the staged
+owner-plan trace and moving actor check. See ARCHITECTURE §8.27–8.28 and
+[`Standalone/Research/WorldAssemblerM3/Round11/REPORT.md`](Standalone/Research/WorldAssemblerM3/Round11/REPORT.md).
 
 ## 4. The density pipeline (most-edited hot path)