core: stamp passage route slabs into the tile cache (L125, evaluator v225)

Conservative route slabs with an outside sentinel, tight expanded segment bounds; DensityGrid exact fallbacks
479k -> 0 per run. Near-ready 2-14% faster than L119, still +4.7..+10.2% vs L109; whole view within -0.5..+8%.
Same look (floor offset 7.884 mm, captures checked), seam audit bit-identical, fast tier + walk audits,
Clang/GCC W1/W8/W12 determinism green. BVH and 25 cm tolerance trials rejected. Not for merge yet.

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

Standalone/Research/WorldAssemblerM3/Linux125/RunL125HashMatrix.py

@@ -0,0 +1,119 @@
+#!/usr/bin/env python3
+"""Check Clang/GCC W1/W8/W12 hashes and compare the candidate with L119."""
+from __future__ import annotations
+
+import json
+import os
+import re
+import subprocess
+import time
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[4]
+OUT = ROOT / os.environ.get("L125_HASH_DIR", "Saved/Linux/l125/hashes")
+DATASETS = {
+    "owner4": ROOT / "Standalone/data/owner_world.json",
+    "owner2": ROOT / "Standalone/data/regression/owner_world_2strate_l61.json",
+}
+BINARIES = {
+    "clang": ROOT / os.environ.get("L125_HASH_CLANG",
+        "Saved/Linux/l125/bin-stamp10/VoxelForgeCoreHeadless-l125-stamp10-clang"),
+    "gcc": ROOT / os.environ.get("L125_HASH_GCC",
+        "Saved/Linux/l125/bin-stamp10/VoxelForgeCoreHeadless-l125-stamp10-gcc"),
+}
+HASH = re.compile(r"^\[Pipeline(?:FullDetailHash|WholeViewHash|LODHash|ExactQueryHash)\].*$", re.M)
+STAMP = re.compile(r"^\[VoxelForgeSourceStamp\] sha256=(\S+)$", re.M)
+
+
+def run(dataset: str, recipe: str, workers: int, compiler: str) -> dict:
+    OUT.mkdir(parents=True, exist_ok=True)
+    label = f"{dataset}-{recipe}-w{workers}-{compiler}"
+    log = OUT / f"{label}.log"
+    layout = OUT / f"{label}.layout.json"
+    command = [
+        "taskset", "-c", "0-11", "prlimit", "--as=6442450944", "--",
+        "timeout", "1740s", str(BINARIES[compiler]), str(DATASETS[dataset]),
+        f"--workers={workers}", "--world-assembler-prototype", "--stream-benchmark",
+        "--stream-pipeline", "--force-generate", "--clip-radius=3",
+        "--max-clip-level=8", "--max-level=8", f"--recipe={recipe}",
+        "--stream-hash", f"--resolved-layout-output={layout}",
+    ]
+    started = time.monotonic()
+    with log.open("w", encoding="utf-8") as stream:
+        result = subprocess.run(command, cwd=ROOT, stdout=stream,
+                                stderr=subprocess.STDOUT, check=False, timeout=1740)
+    output = log.read_text(encoding="utf-8", errors="replace")
+    hashes = HASH.findall(output)
+    if result.returncode or len(hashes) != 12:
+        raise SystemExit(f"hash run failed or incomplete: {label}; exit={result.returncode} "
+                         f"hashes={len(hashes)} log={log}")
+    row = {"dataset": dataset, "recipe": recipe, "workers": workers,
+           "compiler": compiler, "exit_code": result.returncode, "hashes": hashes,
+           "source_stamp": (STAMP.search(output).group(1)
+                            if STAMP.search(output) else None),
+           "elapsed_s": round(time.monotonic() - started, 3),
+           "log": str(log.relative_to(ROOT))}
+    print("[L125HashRun] " + json.dumps(row, sort_keys=True), flush=True)
+    return row
+
+
+def main() -> int:
+    if any(not path.is_file() for path in (*DATASETS.values(), *BINARIES.values())):
+        raise SystemExit("missing L125 hash input")
+    previous_path = ROOT / "Saved/Linux/l119/hashes/summary.json"
+    previous_doc = json.loads(previous_path.read_text(encoding="utf-8"))
+    previous = {(row["dataset"], row["recipe"], row["workers"], row["compiler"]): row
+                for row in previous_doc["runs"]}
+    rows = []
+    recipes = {"owner4": ("surface-world",),
+               "owner2": ("surface-world", "floating-islands")}
+    for dataset, dataset_recipes in recipes.items():
+        for recipe in dataset_recipes:
+            for workers in (1, 8, 12):
+                for compiler in ("clang", "gcc"):
+                    rows.append(run(dataset, recipe, workers, compiler))
+                    (OUT / "runs-partial.json").write_text(
+                        json.dumps(rows, indent=2) + "\n", encoding="utf-8")
+    groups = {}
+    for dataset, dataset_recipes in recipes.items():
+        for recipe in dataset_recipes:
+            key = f"{dataset}/{recipe}"
+            group = [row for row in rows if row["dataset"] == dataset
+                     and row["recipe"] == recipe]
+            reference = group[0]["hashes"]
+            stable = all(row["hashes"] == reference for row in group)
+            old = previous[(dataset, recipe, 12, "clang")]["hashes"]
+            groups[key] = {
+                "all_worker_compiler_hashes_match": stable,
+                "matches_l119_v224": next(row for row in group
+                    if row["workers"] == 12 and row["compiler"] == "clang")["hashes"] == old,
+                "source_stamps": sorted({row["source_stamp"] for row in group}),
+                "runs": [{"workers": row["workers"], "compiler": row["compiler"],
+                          "log": row["log"]} for row in group],
+            }
+            if not stable:
+                raise SystemExit(f"determinism mismatch: {key}")
+    summary = {"runs": rows, "groups": groups}
+    (OUT / "summary.json").write_text(json.dumps(summary, indent=2) + "\n",
+                                      encoding="utf-8")
+    baseline_dir = ROOT / "Standalone/Tools/verify/baselines/owner-hash/canonical"
+    for dataset, recipe, style, baseline_name in (
+        ("owner4", "surface-world", 1,
+         "owner-hash-owner4-surface-world-style1-v225.baseline"),
+        ("owner2", "surface-world", 1,
+         "owner-hash-surface-world-style1-v225.baseline"),
+        ("owner2", "floating-islands", 2,
+         "owner-hash-floating-islands-style2-v225.baseline"),
+    ):
+        canonical = next(row for row in rows if row["dataset"] == dataset
+                         and row["recipe"] == recipe and row["workers"] == 12
+                         and row["compiler"] == "clang")
+        baseline = baseline_dir / baseline_name
+        baseline.write_text("\n".join(canonical["hashes"]) + "\n",
+                            encoding="utf-8")
+    print("[L125HashSummary] " + json.dumps(groups, sort_keys=True), flush=True)
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())