Add obligation discovery pipeline tooling

Sichert die validierte Obligation Discovery Pipeline aus /tmp als dauerhaftes,
committetes Tooling (scripts/obligation_discovery/) — der eigentliche Vermögenswert.

Stufen: precluster (Embedding-Cache + Mikro-Cluster) → meta_cluster (Review Units,
Skalierungs-Fix) → synthesize_obligations (Opus, Key aus ENV, Streaming, harte Tier-Regel,
Provenance) → validate_registry → merge_review_diff. Reine Helfer in _core.py, 16 Unit-Tests.

Doku docs-src/development/obligation_discovery_pipeline_v1.md mit Meilensteinen
(SBOM/Vuln reproduziert, Auth 4408→170 Review Units→54→kuriert 29) und der Architekturregel:
Runtime deterministisch, Discovery LLM-gestützt.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

scripts/obligation_discovery/validate_registry.py

@@ -0,0 +1,35 @@
+"""Stufe 4 — Validierung: belastbare Registry-Checks (kein LLM/Key).
+Prüft die User-Regeln: LEGAL_MINIMUM braucht legal_basis · member_controls vollständig ·
+out_of_scope separat · >8-Obligations/Review-Unit-Warnung. Exit-Code 1 bei hartem Fehler.
+
+  python3 scripts/obligation_discovery/validate_registry.py obligations/cra_authentication.json
+"""
+from __future__ import annotations
+
+import argparse
+import json
+import sys
+
+from _core import validate_registry
+
+
+def main() -> None:
+    ap = argparse.ArgumentParser()
+    ap.add_argument("registry")
+    a = ap.parse_args()
+    reg = json.load(open(a.registry, encoding="utf-8"))
+    v = validate_registry(reg)
+    print(f"=== validate {a.registry} ===")
+    print(f"  obligations:               {v['obligations']}")
+    print(f"  LEGAL_MINIMUM:             {v['legal_minimum']}")
+    print(f"  LM ohne legal_basis:       {v['lm_without_legal_basis'] or 'keine'}")
+    print(f"  member_controls leer:      {v['empty_member_controls'] or 'keine'}")
+    print(f"  >8 Obligations/Review-Unit: {v['over8_per_review_unit'] or 'keine'}")
+    print(f"  out_of_scope:              {v['out_of_scope']}")
+    print(f"  semantische Kanten:        {v['semantic_edges']}")
+    print(f"  PASSED: {v['passed']}")
+    sys.exit(0 if v["passed"] else 1)
+
+
+if __name__ == "__main__":
+    main()