wip: L174 Design50 steps 0-2 in progress (interrupted for a power cut)

Audits collect gates and run seams (landing discs + end runs, LOD0/1), tagged uncapped failures, separate exempt
counts, self-overlap census; level end runs; overlap/turn constraints. Partial sweep: end runs pass 3/3 per seed;
1-2 end-turn violations per seed; 50-110k tagged seam mismatches per seed (real vs audit artefact not yet decided).
Not verified; resume L174.

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

Standalone/Research/WorldAssemblerM3/Design50/README.md

@@ -0,0 +1,104 @@
+# Design50 — why the tunnel landings fail, and the plan (review 2026-11-03)
+
+A read-only review (Claude Opus 5.5, extra-high effort) of `wip/combined-cave` (b097283), with the L133–L173 history and
+the L173 logs. The orchestrator verified R6 and R7a in the code.
+
+**Headline:** one wrong assumption, that a tunnel end is a separate 2-D "landing chamber" owned by the tube, the layer
+and the audits at once. The plan replaces it with a level end run of the same spline plus the Design49 stamp,
+applied last.
+
+## Root causes
+
+- **R1:** the chamber plane and the tube's 1-D h(s) disagree off the centreline (up to 1.3 m at the 7.5 m rim on FI).
+- **R2:** the departure tube descends from the disc centre and undercuts its own landing. Unsupported samples: upper
+  chambers 316, lower 0 (L173); L159 upper pads 96/96 failing, lower 2/96.
+- **R3:** the passage composer overrides the host:
+  - a forced-solid chamber floor slab (`ShapeWorldInternal.h` ~1665);
+  - shell walls filled over host air (~1869–1898);
+  - per-layer corridor exemptions only (Surface World, planned tunnels);
+  - the liminal route stamp re-applied after the carve (~1997, the L146 refill).
+- **R4:** planner self-overlap. The FI helix pitch (3.2–3.9 m) is less than the bore height (~5.8 m), with 2,738
+  overlapping control-point pairs. Upper and lower mouths share XY, so 32/32 final junctions turn 107–178°
+  (curl-back).
+- **R5:** the passage picks the landing height, not the layer. FI departures land inside the FI→TN transition band.
+- **R6 (bug, verified):** `floorProfileIncludesLandingChambers` (set for every passage) makes
+  `PassageFlatFloorCenterZSubvoxels` return early, skipping both blends.
+- **R7 (audits):**
+  - (a) **verified:** the composed audit returns 10 before the seam audit, so seams were never measured;
+  - (b) audits re-model chambers (L159's interior-air 0/16 was a phantom);
+  - (c) exempt probes count as supported; zero-coverage gates pass;
+  - (d) only 8 failures are printed;
+  - (e) the TN and VS sweeps are the same 4-strata world.
+
+## Model
+
+1. **One spline, one floor:** h(s) is level and straight for the first and last a ≥ R+1 m.
+2. **The landing = the end run:** a flat disc radius R at P = h(end); the descent starts outside the disc.
+3. **One composition order:** layer content (including liminal decks) → bore carve (air only, plus a floor shell under
+   the bore where the host is air) → Design49 clamp stamp last, masked by the bore → edits. No walls or roofs over
+   host air; no corridor exemptions.
+4. **Who sets P:** fixed-ground layers (SW, FI, liminal) propose the site and P; for carved layers (TN, VS) the passage
+   picks P and the cave planner connects.
+
+**Keep:**
+- the spline, h(s) and the grade audit;
+- the interior-air gate;
+- cave binding to the end anchors;
+- the L148 envelope, the L156 band fit and the L130 bounds;
+- `l159-pad-stamp.patch` (stamp, bounds, LandingPadAudit plus 4 controls).
+
+**Delete:**
+- the chamber records and their composition, and the slab return;
+- the corridor exemptions and the shell-over-air fills;
+- the flag and both floor blends;
+- the SW plane fit;
+- the chamber audits.
+
+## Steps
+
+- **0:** audits that measure:
+  - collect gates, exit at the end;
+  - seams over discs and end runs at LOD0/1;
+  - tagged failing samples, with no 8-sample cap;
+  - exempt probes counted separately, with a coverage minimum;
+  - a self-overlap census;
+  - Core-exported predicates.
+- **1:** level end runs.
+- **2:** no self-overlap or hairpins:
+  - pitch ≥ bore height + 2 shells + margin;
+  - lower mouth on the ring;
+  - end turns ≤ 60°;
+  - the helix kept out of the landing columns.
+- **3:** the composer and the audits together, with the stamp last.
+- **4:** site selection for fixed-ground layers.
+- **5:** verify (fast tier; TN/VS/native-FI sweeps 16/16; versioned hashes; Clang/GCC W1/W8/W12; captures).
+
+**Owner look decisions:**
+- the disc radius, the end-run length, the cone angle (12°) and reach (8 m);
+- no walls on open-air landings;
+- headroom underground;
+- whether a FI landing may float or must sit on an island;
+- wider spirals (~6 m or more);
+- landings may move.
+
+## Owner decisions (2026-11-03)
+
+- Open-air landings: **no walls**.
+- Floating Islands landings: **add a landing island to the FI plan** at each tunnel end: top at P, footprint wider
+  than the pad, normal island shaping at the edges. It's planned from the seed before generation, and the FI route
+  connects to it. (Not pathfinding the tunnel to an existing island.)
+
+## Owner decision: uniform layer planners (2026-11-03)
+
+- **Planning side: a `LayerPlanner` parent with one child per layer type:**
+  - `Plan(seed, settings)`;
+  - `OnTunnelArrival(end)`, the landing hook: nothing (stamp only), a plan record (FI landing island, liminal walkway,
+    cave connection), or a content request for Unreal;
+  - `ProvideRouteAnchors()`;
+  - `MakeDrawer()`.
+
+  Planning runs once per world, so virtual dispatch costs nothing there.
+- **Drawing side:** keep the `std::variant` adapters with a shared `densityAt` shape (no virtual call per sample;
+  `ShapeWorldInternal.h` ~121), and choose the drawer once per tile.
+- **Migration:** one planner at a time; owner canonical hashes identical after each move (refactor only); the landing
+  hook then implements step 4.

Standalone/Research/WorldAssemblerM3/Linux174/RunL174CaveSeedSweep.py

@@ -0,0 +1,225 @@
+#!/usr/bin/env python3
+"""Capture composed passage, route, shell, and seam attribution for seeds 0..15."""
+from __future__ import annotations
+
+import argparse
+import json
+import re
+import subprocess
+import sys
+import time
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[4]
+DEFAULT_BIN = ROOT / "Standalone/bin/linux/VoxelForgeCoreHeadless-l174-step0-clang"
+DATA = ROOT / "Standalone/data/owner_world.json"
+STAMP_TOOL = ROOT / "Standalone/Tools/verify/source_stamp.py"
+STAMP_RE = re.compile(r"^\[VoxelForgeSourceStamp\] sha256=([0-9a-f]+)$", re.M)
+
+GATES = {
+    "passages": r"^\[ResolvedPassageAuditSummary\].*status=PASS$",
+    "seams": r"^\[PassageTileSeamAudit\].*status=PASS$",
+    "shell": r"^\[PassageShellAuditSummary\].*status=PASS$",
+    "naturalness": r"^\[PassageNaturalnessSummary\].*status=PASS$",
+    "mouth_profile": r"^\[PassageMouthProfileSummary\].*status=PASS$",
+    "ripple": r"^\[PassageRippleAuditSummary\].*status=PASS$",
+    "passage_interior": r"^\[PassageInteriorCapsuleAuditSummary\].*status=PASS$",
+    "self_overlap": r"^\[PassageTubeSelfOverlapAuditSummary\].*status=PASS$",
+}
+
+
+def evaluate(content: str, expected_stamp: str, layout_path: Path,
+             require_end_runs: bool = False) -> tuple[dict, dict, str | None]:
+    stamp = STAMP_RE.search(content)
+    checks = {name: re.search(pattern, content, re.M) is not None
+              for name, pattern in GATES.items()}
+    if require_end_runs:
+        checks["end_runs"] = re.search(
+            r"^\[PassageEndRunAuditSummary\].*status=PASS$", content, re.M) is not None
+    checks["source_stamp"] = stamp is not None and stamp.group(1) == expected_stamp
+    for kind, strate in (("tunnel_network", 2), ("vertical_shafts", 3)):
+        route = re.compile(
+            rf"^\[ResolvedStrateRouteAudit\] strate={strate} .*unsupported=0 "
+            rf"grade_failures=0 .*status=PASS$", re.M)
+        checks[f"{kind}_route"] = route.search(content) is not None
+        checks[f"{kind}_blocked_route_control"] = re.search(
+            rf"^\[{kind.title().replace('_', '')}BlockedRouteControl\].*"
+            r"expected=FAIL status=PASS$", content, re.M) is not None
+    checks["passage_count"] = len(re.findall(
+        r"^\[ResolvedPassageAudit\] .*walkability=PASS$", content, re.M)) == 3
+    checks["negative_controls"] = (
+        len(re.findall(r"^\[ResolvedPassageInteriorNegativeControl\].*"
+                       r"detected=true status=PASS$", content, re.M)) == 3
+        and len(re.findall(r"^\[ResolvedPassageBlockedControl\].*detected=true$",
+                           content, re.M)) == 3
+    )
+    attribution = {
+        "seam_samples_by_tag": {
+            tag: len(re.findall(rf"^\[PassageTileSeamSample\] tag={re.escape(tag)} ",
+                                content, re.M))
+            for tag in ("disc", "rim", "end run", "body", "route")
+        },
+        "landing_support_failures_upper": len(re.findall(
+            r"^\[PassageLandingSupportFailure\].*side=upper", content, re.M)),
+        "landing_support_failures_lower": len(re.findall(
+            r"^\[PassageLandingSupportFailure\].*side=lower", content, re.M)),
+        "unsupported_walk_samples": len(re.findall(
+            r"^\[ResolvedWalkDispatch\] kind=unsupported", content, re.M)),
+        "shell_floor_samples": len(re.findall(
+            r"^\[PassageShellAuditSample\]", content, re.M)),
+        "shell_wall_samples": len(re.findall(
+            r"^\[PassageShellAuditSample\].*kind=wall_missing", content, re.M)),
+        "tube_self_overlap_rows": len(re.findall(
+            r"^\[PassageTubeSelfOverlapAudit\]", content, re.M)),
+        "tube_self_overlap_pairs": sum(int(value) for value in re.findall(
+            r"^\[PassageTubeSelfOverlapAudit\].*overlap_pairs=(\d+)",
+            content, re.M)),
+        "tube_end_turn_violations": sum(int(value) for value in re.findall(
+            r"^\[PassageTubeSelfOverlapAudit\].*end_turn_violations=(\d+)",
+            content, re.M)),
+        "tube_landing_column_violations": sum(int(value) for value in re.findall(
+            r"^\[PassageTubeSelfOverlapAudit\].*landing_column_violations=(\d+)",
+            content, re.M)),
+        "end_run_failures": len(re.findall(
+            r"^\[PassageEndRunAudit\].*status=FAIL$", content, re.M)),
+        "end_run_measured": len(re.findall(
+            r"^\[PassageEndRunAudit\].*measured_start_m=(?!0\.000)"
+            r".*measured_end_m=(?!0\.000)", content, re.M)),
+    }
+    seam_summary = re.search(r"^\[PassageTileSeamAudit\].*$", content, re.M)
+    if seam_summary:
+        for key in ("candidates", "examined", "pairs", "lod0_pairs", "lod0_samples",
+                    "lod1_pairs", "lod1_samples", "landing_discs", "end_runs",
+                    "lod0_disc_samples", "lod1_disc_samples", "lod0_rim_samples",
+                    "lod1_rim_samples", "lod0_end_run_samples",
+                    "lod1_end_run_samples", "exempt_pairs", "mismatches"):
+            match = re.search(rf"\b{key}=(\d+)", seam_summary.group(0))
+            attribution[f"seam_{key}"] = int(match.group(1)) if match else None
+        for key in ("landing_discs", "end_runs"):
+            match = re.search(rf"\b{key}=(\d+)/(\d+)", seam_summary.group(0))
+            if match:
+                attribution[f"seam_{key}_covered"] = int(match.group(1))
+                attribution[f"seam_{key}_required"] = int(match.group(2))
+        attribution["seam_uncovered_disc_regions"] = len(re.findall(
+            r"^\[PassageTileSeamCoverage\].*\bdisc_status=FAIL\b", content, re.M))
+        attribution["seam_uncovered_end_run_regions"] = len(re.findall(
+            r"^\[PassageTileSeamCoverage\].*\bend_run_status=FAIL\b", content, re.M))
+        attribution["seam_uncovered_regions"] = (
+            attribution["seam_uncovered_disc_regions"]
+            +attribution["seam_uncovered_end_run_regions"])
+    passage_summary = re.search(r"^\[ResolvedPassageAuditSummary\].*$", content, re.M)
+    if passage_summary:
+        for key in ("support_probes", "exempt_support_probes", "unsupported"):
+            match = re.search(rf"\b{key}=(\d+)", passage_summary.group(0))
+            if match:
+                attribution[key] = int(match.group(1))
+    identity = None
+    try:
+        if layout_path.is_file():
+            identity = json.loads(layout_path.read_text(encoding="utf-8")).get(
+                "stable_identity")
+    except (OSError, json.JSONDecodeError):
+        pass
+    checks["layout_output"] = identity is not None
+    return checks, attribution, identity
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--binary", type=Path, default=DEFAULT_BIN)
+    parser.add_argument("--out", type=Path,
+        default=ROOT / "Saved/Linux/l174/rebaseline-l173/seeds")
+    parser.add_argument("--seed-start", type=int, default=0)
+    parser.add_argument("--seed-stop", type=int, default=16,
+        help="exclusive seed bound")
+    parser.add_argument("--expected-stamp", type=str,
+        help="source stamp embedded in an earlier binary")
+    parser.add_argument("--require-end-runs", action="store_true",
+        help="require the L174 end-run audit (use for post-Step-1 sweeps)")
+    parser.add_argument("--no-resume", action="store_true",
+        help="rerun even when both the log and layout already exist")
+    args = parser.parse_args()
+    if not args.binary.is_file() or not DATA.is_file():
+        raise SystemExit(f"missing binary or owner fixture: {args.binary}")
+    args.binary = args.binary.resolve()
+    args.out = args.out.resolve()
+    args.out.mkdir(parents=True, exist_ok=True)
+    stamp = args.expected_stamp or subprocess.check_output(
+        [sys.executable, str(STAMP_TOOL), "stamp", "--root", str(ROOT)], text=True).strip()
+    results = []
+    partial = args.out / "runs-partial.json"
+    for seed in range(args.seed_start, args.seed_stop):
+        log = args.out / f"seed{seed}.log"
+        layout = args.out / f"seed{seed}.layout.json"
+        exit_path = args.out / f"seed{seed}.exit"
+        command = [
+            "taskset", "-c", "0-11", "prlimit", "--as=6442450944", "--",
+            "timeout", "1740s", str(args.binary), str(DATA),
+            "--world-assembler-prototype", "--stream-benchmark", "--stream-pipeline",
+            "--workers=8", "--clip-radius=3", "--max-clip-level=8", "--max-level=0",
+            "--force-generate", f"--seed={seed}", "--recipe=surface-world",
+            "--density-dispatch-report", "--audit-resolved-layout-passages",
+            "--audit-passage-tile-seams", f"--resolved-layout-output={layout}",
+        ]
+        started = time.monotonic()
+        resumed = False
+        if not args.no_resume and log.is_file() and layout.is_file():
+            content = log.read_text(encoding="utf-8", errors="replace")
+            if exit_path.is_file():
+                code: int | str = int(exit_path.read_text().strip())
+            elif ("[PipelineExactQueryHash]" in content
+                    and "[ResolvedPassageAuditSummary]" in content):
+                code = 10 if re.search(r"^\[[^]]*(?:Summary|Audit)\].*status=FAIL$",
+                    content, re.M) else 0
+            else:
+                code = "NO_EXIT_RECORD"
+            resumed = code != "NO_EXIT_RECORD"
+        if not resumed:
+            try:
+                with log.open("w", encoding="utf-8") as output:
+                    proc = subprocess.run(command, cwd=ROOT, stdout=output,
+                        stderr=subprocess.STDOUT, check=False, timeout=1740)
+                code = proc.returncode
+            except subprocess.TimeoutExpired:
+                code = "OUTER_TIMEOUT"
+            if isinstance(code, int):
+                exit_path.write_text(str(code) + "\n", encoding="utf-8")
+        content = log.read_text(encoding="utf-8", errors="replace") if log.exists() else ""
+        checks, attribution, identity = evaluate(
+            content, stamp, layout, args.require_end_runs)
+        passed = code == 0 and all(checks.values())
+        failed = [name for name, ok in checks.items() if not ok]
+        row = {
+            "seed": seed,
+            "verdict": "PASS" if passed else "FAIL",
+            "exit": code,
+            "failed_gates": failed,
+            "checks": checks,
+            "attribution": attribution,
+            "source_stamp": stamp,
+            "layout_identity": identity,
+            "elapsed_s": round(time.monotonic() - started, 3),
+            "log": str(log.relative_to(ROOT)),
+            "layout": str(layout.relative_to(ROOT)),
+            "resumed": resumed,
+        }
+        results.append(row)
+        partial.write_text(json.dumps(results, indent=2) + "\n", encoding="utf-8")
+        print("[L174CaveSeedSweep] " + json.dumps(row, sort_keys=True), flush=True)
+    summary = {
+        "source_stamp": stamp,
+        "seeds": list(range(args.seed_start, args.seed_stop)),
+        "passed": sum(row["verdict"] == "PASS" for row in results),
+        "failed": sum(row["verdict"] != "PASS" for row in results),
+        "results": results,
+    }
+    (args.out / "summary.json").write_text(
+        json.dumps(summary, indent=2) + "\n", encoding="utf-8")
+    print(f"[L174CaveSeedSweepSummary] passed={summary['passed']}/{len(results)} "
+          f"failed={summary['failed']}", flush=True)
+    return 0 if summary["failed"] == 0 else 1
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())