research: headroom-only landings, band fit, bore exemption (L156; last landing round, kept as patch)

Band fit works (all chambers inside host bands, 16/16 seeds both sweeps); chamber support exemption + open-floor
control work; found a metres/subvoxel mix in the shell-opening predicate. Still fails: upper landing evaluated grade
22.85 deg over native ground; TN and VS sweeps 0/16; UE 30 m/s near coverage 39.0% vs 45.5%. Owner: stop forcing
landings after this round.

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

Standalone/Research/WorldAssemblerM3/Linux156/FinalizeL156SeedSweep.py

@@ -0,0 +1,61 @@
+#!/usr/bin/env python3
+"""Recompute the full 16-seed sweep summaries and landing band margins."""
+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+from PassageEnvelopeAudit import _landing_content_band_audit
+
+
+ROOT = Path(__file__).resolve().parents[4]
+OUT = ROOT / "Saved/Linux/l156/seeds"
+
+
+def finalize(kind: str) -> dict:
+    directory = OUT / kind
+    partial = directory / "runs-partial.json"
+    results = json.loads(partial.read_text(encoding="utf-8")) if partial.is_file() else []
+    for row in results:
+        layout_path = ROOT / row["layout"]
+        bands = _landing_content_band_audit(
+            json.loads(layout_path.read_text(encoding="utf-8"))) if layout_path.is_file() else []
+        band_pass = len(bands) == 6 and all(entry["passed"] for entry in bands)
+        envelope = row.get("envelope_audit") or {}
+        envelope["landing_content_band"] = bands
+        envelope["landing_content_band_passed"] = band_pass
+        envelope["passed"] = bool(envelope.get("passed") and band_pass)
+        row["envelope_audit"] = envelope
+        checks = row.setdefault("checks", {})
+        checks["envelope"] = bool(envelope["passed"]
+            and envelope.get("outside_chamber_conflicts") == 0)
+        checks["envelope_negative_control"] = bool(
+            envelope.get("negative_controls") == envelope.get("negative_controls_expected") == 1)
+        checks["landing_content_band"] = band_pass
+        failed = [name for name, passed in checks.items() if not passed]
+        row["verdict"] = "PASS" if not failed else "FAIL"
+        row["reason"] = ", ".join(failed) if failed else "all requested gates pass"
+    results.sort(key=lambda row: row["seed"])
+    completed = len(results)
+    passed = sum(row["verdict"] == "PASS" for row in results)
+    missing = sorted(set(range(16)) - {row["seed"] for row in results})
+    summary = {"kind": kind, "source_stamp": (
+        "4bf096c0a06f72eb765ff8785d55c00ded946ed1bd1f39fa1914b3658ceb61f0"),
+        "completed": completed, "passed": passed, "failed": completed - passed,
+        "missing_seeds": missing, "status": "PASS" if completed == 16 and passed == 16 else "FAIL",
+        "results": results}
+    partial.write_text(json.dumps(results, indent=2) + "\n", encoding="utf-8")
+    (directory / "summary.json").write_text(json.dumps(summary, indent=2) + "\n",
+                                            encoding="utf-8")
+    print(f"[L156SeedSweepFinal] kind={kind} passed={passed}/{completed} "
+          f"missing={len(missing)} status={summary['status']}")
+    return summary
+
+
+if __name__ == "__main__":
+    import argparse
+
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--kind", choices=("tunnel-network", "vertical-shafts"), required=True)
+    args = parser.parse_args()
+    raise SystemExit(0 if finalize(args.kind)["status"] == "PASS" else 1)