feat(migration): enrich internal committee entries — fix case_number + metadata + halachot

- precedent_metadata_extractor: add case_number_clean extraction field
- apply_to_record: overwrite_case_number param for one-time migration
- internal_decisions: enrich_migrated_entries() — runs metadata then queues halachot
- server: expose as internal_decision_enrich MCP tool

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

mcp-server/src/legal_mcp/services/internal_decisions.py

@@ -285,6 +285,68 @@ async def migrate_from_external_corpus(dry_run: bool = False) -> dict:
     return results
 
 
+async def enrich_migrated_entries(dry_run: bool = False) -> dict:
+    """One-time enrichment: run metadata extraction + halacha extraction on all
+    internal_committee entries that are waiting (halacha_status='pending',
+    metadata never requested).
+
+    Metadata extraction will:
+      - Fix case_number from the decision header text
+      - Fill case_name from the parties line
+      - Fill date if missing
+
+    Halacha extraction queues the LLM-based halacha extraction job.
+    """
+    from legal_mcp.services import precedent_metadata_extractor, db as _db
+
+    pool = await _db.get_pool()
+    async with pool.acquire() as conn:
+        rows = await conn.fetch(
+            """SELECT id, case_number
+               FROM case_law
+               WHERE source_kind = 'internal_committee'
+                 AND halacha_extraction_status = 'pending'
+                 AND metadata_extraction_requested_at IS NULL
+               ORDER BY created_at"""
+        )
+
+    results = {
+        "total": len(rows),
+        "metadata_updated": 0,
+        "halachot_queued": 0,
+        "failed": 0,
+        "dry_run": dry_run,
+    }
+
+    if dry_run:
+        return results
+
+    for row in rows:
+        case_law_id = row["id"]
+        try:
+            meta = await precedent_metadata_extractor.extract_and_apply(
+                case_law_id, overwrite_case_number=True
+            )
+            if meta.get("status") in ("completed", "no_changes"):
+                results["metadata_updated"] += 1
+                logger.info(
+                    "enrich_migrated: %s → fields=%s",
+                    row["case_number"], meta.get("fields"),
+                )
+        except Exception as e:
+            logger.error("enrich_migrated metadata failed for %s: %s", row["case_number"], e)
+            results["failed"] += 1
+            continue
+
+        try:
+            await _db.request_halacha_extraction(case_law_id)
+            results["halachot_queued"] += 1
+        except Exception as e:
+            logger.error("enrich_migrated halacha queue failed for %s: %s", row["case_number"], e)
+
+    return results
+
+
 async def search_internal(
     query: str,
     *,