unreal: startup boost spans epoch churn; empty collision tiles stay classified (L92)

- Startup apply boost (24 meshes / 14 ms) now ends on initial LOD0-2 + collision readiness or
  the 30 s timeout, not on the first desired-epoch change: FI LOD0-2 settled 3.49 -> 3.40 s.
- Known-empty LOD0 collision classifications persist across unloads within a modification epoch
  and are invalidated on edits; commandlet readiness accepts CollisionNotRequired tiles. The 30 m/s
  movement trace now passes (no re-requests of the 4 support tiles).
- Startup trace events: SerializeResolvedWorld ~466 ms synchronous in BeginPlay (unchanged);
  SW bReady at 2.74 s vs FI 0.75 s (to investigate). Redundant second parse removed.
- Core output identical. Fast tier PASS; Linux UE builds. R42 notes attached.

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

Standalone/Research/WorldAssemblerM3/Linux92/RunL92UnrealFastMove.py

@@ -0,0 +1,158 @@
+#!/usr/bin/env python3
+"""Run the L80 30 m/s policy-3 Unreal trace for Linux 92."""
+from __future__ import annotations
+
+import csv
+import json
+import re
+import subprocess
+import time
+from collections import Counter
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[4]
+HOST = Path("/home/jahni/VFHost")
+HOST_PLUGIN_SAVED = HOST / "Plugins/VoxelForge/Saved/Linux/l92"
+HOST_SAVED = HOST / "Saved/Linux/l92"
+EDITOR = Path("/home/jahni/UnrealEngine/Engine/Binaries/Linux/UnrealEditor-Cmd")
+OUT = ROOT / "Saved/Linux/l92/movement/unreal"
+SPAWN_M = (19.166015625, -14.2001953125, -753.3740234375)
+SPEED_CM_S = 3000.0
+MOVE_START_S = 6.0
+MOVE_DURATION_S = 12.0
+DWELL_S = 5.0
+EXIT_S = MOVE_START_S + MOVE_DURATION_S + DWELL_S
+ORPHAN_KEYS = {(47, -2, -99), (47, -2, -100), (47, -2, -101), (47, -2, -102)}
+
+
+def read_events(path: Path) -> list[dict]:
+    events = []
+    if path.is_file():
+        for line in path.read_text(encoding="utf-8", errors="replace").splitlines():
+            if line.startswith("{"):
+                try:
+                    events.append(json.loads(line))
+                except json.JSONDecodeError:
+                    pass
+    return events
+
+
+def main() -> int:
+    if not EDITOR.is_file():
+        raise SystemExit(f"missing Unreal commandlet executable: {EDITOR}")
+    OUT.mkdir(parents=True, exist_ok=True)
+    label = "fast-L80"
+    trace, abslog, stdout = (OUT / f"{label}.trace.jsonl", OUT / f"{label}.log",
+                             OUT / f"{label}.stdout.log")
+    output = HOST_PLUGIN_SAVED / "output" / label
+    userdir = HOST_SAVED / "user" / label
+    zendata = HOST_SAVED / "zen" / label
+    ddc = HOST_SAVED / "DDC"
+    for directory in (output, userdir, zendata, ddc):
+        directory.mkdir(parents=True, exist_ok=True)
+    trace.unlink(missing_ok=True)
+    spawn_cm = ",".join(f"{value * 100.0:.3f}" for value in SPAWN_M)
+    command = [
+        str(EDITOR), str(HOST / "VFHost.uproject"), "-nullrhi", "-unattended",
+        "-nop4", "-nosplash", "-NoSound", "-corelimit=12", "-NoZenAutoLaunch",
+        "-notraceserver", "-nocrashreports", "-DisablePlugins=AndroidFileServer",
+        "-ddc=NoZenLocalFallback", f"-userdir={userdir}", f"-ZenDataPath={zendata}",
+        f"-LocalDataCachePath={ddc}", "-run=VoxelForgeExplore", "-seed=0",
+        "-archetype=TunnelNetwork", "-slot=0", "-modes=export", "-gameconfig=1",
+        "-coreworldtest=1", "-ownerfourstrateplan=1", "-corevoxelsizecm=25",
+        "-coreislandtest=0", "-corefallbacktest=0", "-coreofftest=0", "-coreplantest=0",
+        "-settingsref=/Game/VoxelForge/DA_Settings.DA_Settings", "-corehybridmesher=0",
+        f"-out={output}", "-voxel.StreamingCoarseFirst=1",
+        "-voxel.StreamingDynamicNearReserve=1", "-voxel.StreamingLegacyPendingResultCap=0",
+        "-voxel.CoreRegionConcurrentAdmission=1", "-voxel.StreamingResultBacklogCap=256",
+        "-voxel.StreamingReadyQueueDepth=8", "-voxel.StreamingBackgroundWorkerCap=1",
+        "-voxel.CoreColumnCacheDirectMapped=0", "-voxel.CoreMCGradientMemoization=1",
+        "-voxel.StreamingCollisionLookahead=1", "-voxel.StreamingStartupApplyBoost=1",
+        "-voxel.TestMove=1", f"-voxel.TestMoveSpeedCmPerSecond={SPEED_CM_S:.1f}",
+        f"-voxel.TestMoveStartSeconds={MOVE_START_S:.1f}",
+        f"-voxel.TestMoveDurationSeconds={MOVE_DURATION_S:.1f}",
+        f"-voxel.TestExitSeconds={EXIT_S:.1f}", "-voxel.TestMoveDirection=1,0,0",
+        "-voxel.StreamingSchedulerPolicy=3", "-voxel.TestExitOnSteady=0",
+        "-coreworldstreamtrace=1", f"-voxel.StartupTraceSpawnCm={spawn_cm}",
+        "-voxel.StartupTraceUntilEndPlay=1", "-voxel.StartupTraceThroughCrossing=1",
+        "-voxel.StartupTraceMaxTiles=16384", f"-voxel.StartupTraceFile={trace}",
+        f"-abslog={abslog}",
+    ]
+    started = time.monotonic()
+    with stdout.open("w", encoding="utf-8") as stream:
+        result = subprocess.run(["taskset", "-c", "0-11", "timeout", "1740s", *command],
+                                cwd=ROOT, stdout=stream, stderr=subprocess.STDOUT,
+                                check=False, timeout=1740)
+
+    events = read_events(trace)
+    samples = [e for e in events if e.get("type") == "streaming_sample"]
+    move = [e for e in samples if float(e.get("speed_cm_s", 0.0)) >= 50.0]
+    stop = next((e for e in events if e.get("type") == "streaming_test_move_stopped"), None)
+    stop_t = float(stop.get("t_s", 0.0)) if stop else (
+        float(move[0].get("t_s", 0.0)) + MOVE_DURATION_S if move else float("inf"))
+    dwell = [e for e in samples if float(e.get("t_s", 0.0)) >= stop_t
+             and float(e.get("speed_cm_s", 0.0)) < 50.0]
+    rows = []
+    for event in samples:
+        desired = event.get("desired_by_lod", [0] * 9)
+        resident = event.get("resident_by_lod", [0] * 9)
+        covered = event.get("covered_by_lod", resident)
+        far_desired = sum(desired[3:])
+        far_covered = sum(covered[3:])
+        near_desired = sum(desired[:3])
+        near_resident = sum(resident[:3])
+        rows.append({
+            "t_s": event.get("t_s"), "speed_cm_s": event.get("speed_cm_s"),
+            "far_desired": far_desired, "far_covered": far_covered,
+            "far_hole_pct": round(100.0 * (far_desired - far_covered)
+                                   / max(1, far_desired), 3),
+            "near_desired": near_desired, "near_resident": near_resident,
+            "near_ready_pct": round(100.0 * near_resident / max(1, near_desired), 3),
+        })
+    moving_holes = [row["far_hole_pct"] for row in rows
+                    if float(row["speed_cm_s"] or 0.0) >= 50.0]
+    moving_near = [row["near_ready_pct"] for row in rows
+                   if float(row["speed_cm_s"] or 0.0) >= 50.0]
+    dwell_rows = [row for row in rows
+                  if float(row["t_s"] or 0.0) >= stop_t
+                  and float(row["speed_cm_s"] or 0.0) < 50.0]
+    orphan = Counter()
+    for event in events:
+        key = event.get("tile", event.get("key"))
+        if key is not None and tuple(key) in ORPHAN_KEYS:
+            orphan[(tuple(key), event.get("type"))] += 1
+    stdout_text = stdout.read_text(encoding="utf-8", errors="replace")
+    core_failure = re.search(r"\[VoxelForgeCoreWorldTest\] failed: ([^\r\n]+)", stdout_text)
+    core_pass = "[VoxelForgeCoreWorldTest] pass complete=1" in stdout_text
+    result_row = {
+        "label": label, "policy": "L80", "policy_id": 3,
+        "speed_cm_s": SPEED_CM_S, "exit_code": result.returncode,
+        "wall_s": round(time.monotonic() - started, 3),
+        "sample_count": len(samples), "moving_samples": len(move),
+        "dwell_samples": len(dwell), "core_world_test_pass": core_pass,
+        "core_world_test_failure": core_failure.group(1) if core_failure else None,
+        "far_holes_moving_mean_pct": round(sum(moving_holes) / max(1, len(moving_holes)), 3),
+        "near_ready_moving_mean_pct": round(sum(moving_near) / max(1, len(moving_near)), 3),
+        "far_holes_dwell_last_pct": dwell_rows[-1]["far_hole_pct"] if dwell_rows else None,
+        "near_ready_dwell_last_pct": dwell_rows[-1]["near_ready_pct"] if dwell_rows else None,
+        "move_stopped_t_s": stop_t if stop else None,
+        "orphan_key_events": {f"{key}:{event_type}": count
+                              for (key, event_type), count in sorted(orphan.items())},
+        "trace": str(trace.relative_to(ROOT)), "abslog": str(abslog.relative_to(ROOT)),
+        "stdout": str(stdout.relative_to(ROOT)),
+    }
+    (OUT / "summary.json").write_text(json.dumps(result_row, indent=2) + "\n",
+                                       encoding="utf-8")
+    if rows:
+        with (OUT / "samples.csv").open("w", newline="", encoding="utf-8") as stream:
+            writer = csv.DictWriter(stream, fieldnames=list(rows[0]))
+            writer.writeheader()
+            writer.writerows(rows)
+    print("[L92FastMove] " + json.dumps(result_row, sort_keys=True), flush=True)
+    if result.returncode != 0 or not core_pass or len(move) < 40 or len(dwell) < 16:
+        return 1
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())