feat: sync external source tier governance

scripts/high_rigor_closure_snapshot.py

@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+"""Materialize high-rigor closure gate output as a dated evidence snapshot."""
+
+from __future__ import annotations
+
+import argparse
+import hashlib
+import json
+from pathlib import Path
+from typing import Any
+
+from scripts.high_rigor_closure_gate import build_report
+
+
+def stable_json(data: Any) -> str:
+    return json.dumps(data, ensure_ascii=False, sort_keys=True, separators=(",", ":"), default=str)
+
+
+def build(date: str) -> dict[str, Any]:
+    report = build_report()
+    snapshot = {
+        "scope": "high_rigor_closure_gate_snapshot",
+        "created_at": date,
+        "source_scope": report["scope"],
+        "overall_status": report["overall_status"],
+        "production_tuning_allowed": report["production_tuning_allowed"],
+        "verified_day_month_timing_allowed": report["verified_day_month_timing_allowed"],
+        "birth_time_truth_allowed": report["birth_time_truth_allowed"],
+        "commercial_sync_allowed": report["commercial_sync_allowed"],
+        "gates": report["gates"],
+        "next_actions": report["next_actions"],
+        "boundary": "Snapshot of gate state only; blocked/partial gates remain blocked until their evidence packets close.",
+    }
+    snapshot["snapshot_hash"] = hashlib.sha256(stable_json(snapshot).encode("utf-8")).hexdigest()
+    return snapshot
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--date", default="2026-07-20")
+    args = parser.parse_args()
+    print(json.dumps(build(args.date), ensure_ascii=False, indent=2, sort_keys=True))
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())