feat(corpus): corpus redesign — eliminate halacha queue, verified-by-citation layer, rank-at-retrieval (#153)

Implements chaim's 2026-06-20 directive (5 steps; step 6 deferred):
1. No review queue — HALACHA_NO_REVIEW_QUEUE=true (auto-approve all → background);
   migration cleared 2,416 pending_review → approved.
2. Verified layer — halachot.verified/cite_count from chair citations
   (db.refresh_verified_layer + scripts/build_verified_layer.py runs citator on
   ALL committee decisions). 2,775 verified / 137 precedents.
3. Retrieval ranks verified ≫ background — HALACHA_VERIFIED_BOOST in both semantic
   + lexical halacha queries; filter now includes background (<> rejected).
5. Disabled destructive panel cap/novelty — HALACHA_PANEL_REGIME_ENABLED=false
   (8508/1049/1200 proved it lost 22-30 genuine principles incl. Lustrenik).
4. Ingest contract — going-forward already queues metadata; backfill_practice_area.py
   + 206 re-queued to the metadata drain.

Source of truth: docs/precedent-corpus-redesign/00-final-synthesis.md. Quality flags
are 97% false-positive (nli-audit) → no longer gate. UI queue removal → Claude Design
gate. 429 tests green (no regressions).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

scripts/build_verified_layer.py

@@ -0,0 +1,53 @@
+#!/usr/bin/env python3
+"""Build the verified principle layer from chair citations (#153, corpus redesign).
+
+"Trusted = citation, not review" (chaim 2026-06-20). A principle is `verified` iff
+its SOURCE precedent was actually cited by a chair (any committee decision); never
+from human review. This:
+  1. Runs the citator (`extract_internal_citations`) over ALL committee decisions —
+     not just דפנה's — so other chairs' citations populate the graph too (tier-2).
+  2. Recomputes halachot.verified / cite_count from precedent_internal_citations.
+
+Idempotent. Run after ingesting new chair decisions (or wire into the ingest path)
+so the verified layer grows automatically. EMBEDDING/REGEX-only for the citator,
+no LLM.
+
+  cd ~/legal-ai/mcp-server
+  HOME=/home/chaim .venv/bin/python ../scripts/build_verified_layer.py            # full
+  HOME=/home/chaim .venv/bin/python ../scripts/build_verified_layer.py --no-citator  # refresh only
+"""
+from __future__ import annotations
+
+import argparse
+import asyncio
+import os
+import sys
+
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "mcp-server", "src"))
+
+from legal_mcp.services import citation_extractor, db  # noqa: E402
+
+
+async def _run(run_citator: bool) -> int:
+    if run_citator:
+        print("→ extracting citations from ALL committee decisions (citator)…", flush=True)
+        res = await citation_extractor.extract_all_internal_committee()
+        print(f"  citator: {res}", flush=True)
+    print("→ refreshing verified/cite_count from chair citations…", flush=True)
+    stats = await db.refresh_verified_layer()
+    print(f"\n── verified layer ──")
+    print(f"   verified principles: {stats['verified_principles']}")
+    print(f"   verified precedents: {stats['verified_precedents']}")
+    return 0
+
+
+def main() -> int:
+    p = argparse.ArgumentParser(description="Build verified principle layer (#153)")
+    p.add_argument("--no-citator", action="store_true",
+                   help="skip citation extraction; only recompute verified/cite_count")
+    a = p.parse_args()
+    return asyncio.run(_run(run_citator=not a.no_citator))
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())