core: Vertical Shafts on the shared Core cave planner (L139, v237; 15/16 seeds)

Shaft mode reuses PlanResolvedCavernNetworkV1 with a capped full-height cylinder primitive (shapeKind=1), ledges,
access bores and cross links; 11 VerticalShaftParams fields mapped. Basal law: arrival 2-3 to a walkable terminal
landing; drops/climbs stay reporting tiers. Seed 2 fails shell/seams at the 2-3 arrival mouth (3 variants tried,
stopped per AGENTS.md). Whole view faster than assembler/world in 8/8 cells; near-ready slower in 7/8.
Source/: VoxelForgeCoreAdapter.cpp.

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

Standalone/Research/WorldAssemblerM3/Linux139/RunL139Determinism.py

@@ -0,0 +1,86 @@
+#!/usr/bin/env python3
+"""Compare composed owner hashes and resolved graph identity at W1/W8/W12."""
+from __future__ import annotations
+
+import json
+import re
+import subprocess
+import time
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[4]
+OUT = ROOT / "Saved/Linux/l139/determinism"
+DATA = ROOT / "Standalone/data/owner_world.json"
+STAMP = "b8603b6cb3975ca0f9669759e4e2464561c557fdb7aa6836acef123ecf0b99d1"
+BINARIES = {
+    "clang": ROOT / "Saved/Linux/l139/bin/VoxelForgeCoreHeadless-l139-clang",
+    "gcc": ROOT / "Saved/Linux/l139/bin/VoxelForgeCoreHeadless-l139-gcc",
+}
+CAMERA = "-20.062500,-5.068359,-900.353516,0,0"
+HASH_RE = re.compile(
+    r"^\[Pipeline(?:FullDetailHash|WholeViewHash|MaterialHash|LODHash|ExactQueryHash)\].*$",
+    re.M)
+STAMP_RE = re.compile(r"^\[VoxelForgeSourceStamp\] sha256=([0-9a-f]+)$", re.M)
+
+
+def main() -> int:
+    if any(not path.is_file() for path in (DATA, *BINARIES.values())):
+        raise SystemExit("missing L139 determinism binary or composed owner fixture")
+    OUT.mkdir(parents=True, exist_ok=True)
+    rows = []
+    reference_hashes: tuple[str, ...] | None = None
+    reference_layout_identity: str | None = None
+    for compiler, binary in BINARIES.items():
+        for workers in (1, 8, 12):
+            name = f"determinism-{compiler}-w{workers}"
+            log, layout = OUT / f"{name}.log", OUT / f"{name}.json"
+            command = ["taskset", "-c", "0-11", "prlimit", "--as=6442450944", "--",
+                "timeout", "1740s", str(binary), str(DATA), "--world-assembler-prototype",
+                "--stream-benchmark", "--stream-pipeline", f"--workers={workers}",
+                "--clip-radius=3", "--max-clip-level=8", "--max-level=0",
+                f"--camera={CAMERA}", "--stream-hash", "--force-generate", "--seed=0",
+                "--recipe=surface-world", "--render-distance-chunks=0",
+                "--density-dispatch-report", f"--resolved-layout-output={layout}"]
+            started = time.monotonic()
+            with log.open("w", encoding="utf-8") as output:
+                proc = subprocess.run(command, cwd=ROOT, stdout=output,
+                                      stderr=subprocess.STDOUT, check=False, timeout=1740)
+            content = log.read_text(encoding="utf-8", errors="replace")
+            stamp = STAMP_RE.search(content)
+            hashes = tuple(HASH_RE.findall(content))
+            current_layout = json.loads(layout.read_text(encoding="utf-8"))
+            stable_identity = current_layout.get("stable_identity")
+            dispatch_ok = bool(re.search(
+                r"^\[DensityDispatch\] strate=3 generator=VerticalShafts "
+                r"recipe=Core\.Caves\.PrimitiveField version=1 "
+                r"bound_path=Caves-native adapter=FCavesFieldAdapter$", content, re.M))
+            passed = (proc.returncode == 0 and stamp is not None and stamp.group(1) == STAMP
+                      and len(hashes) >= 4 and dispatch_ok and bool(stable_identity))
+            if reference_hashes is None and passed:
+                reference_hashes = hashes
+                reference_layout_identity = stable_identity
+            else:
+                passed = (passed and hashes == reference_hashes
+                          and stable_identity == reference_layout_identity)
+            row = {"compiler": compiler, "workers": workers, "exit": proc.returncode,
+                   "stamp": stamp.group(1) if stamp else None, "hash_lines": len(hashes),
+                   "hashes_match_first": hashes == reference_hashes,
+                   "layout_identity": stable_identity,
+                   "layout_matches_first": stable_identity == reference_layout_identity,
+                   "shaft_dispatch": dispatch_ok, "passed": bool(passed),
+                   "elapsed_s": round(time.monotonic() - started, 3),
+                   "log": str(log.relative_to(ROOT)), "layout": str(layout.relative_to(ROOT))}
+            rows.append(row)
+            print("[L139DeterminismRun] " + json.dumps(row, sort_keys=True), flush=True)
+            (OUT / "runs-partial.json").write_text(json.dumps(rows, indent=2) + "\n")
+            if not passed:
+                raise SystemExit(f"composed owner determinism mismatch; see {log}")
+    (OUT / "summary.json").write_text(json.dumps({"status": "PASS", "stamp": STAMP,
+        "layout_identity": reference_layout_identity, "runs": rows}, indent=2) + "\n")
+    print(f"[L139DeterminismSummary] runs={len(rows)} source_stamp={STAMP} status=PASS")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())