feat(halacha): --case-number filter for panel triage script

Scope halacha_panel_approve.py to a single case's pending halachot so the
3-judge deliberation (#133/FU-2) can be captured on demand for one case
(e.g. after a fresh extraction) instead of running the whole ~1.5k queue.
Capture-only path unchanged; no auto-approval. Applied before --limit.

Invariants: G1 (scope at source, not a parallel route) · G2 (reuses the
existing panel/capture path) · INV-G10 (chair gate untouched — dry-run
captures to halacha_panel_rounds only).

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

scripts/halacha_panel_approve.py

@@ -178,6 +178,10 @@ async def main(args: argparse.Namespace) -> int:
     print(f"judges available — deepseek:{bool(DEEPSEEK_KEY)} gemini:{bool(GEMINI_KEY)} "
           f"claude:local\n", flush=True)
     pending = await db.list_halachot(review_status="pending_review", limit=5000)
+    if args.case_number:
+        want = args.case_number.strip()
+        pending = [h for h in pending if (h.get("case_number") or "").strip() == want]
+        print(f"scoped to case {want}: {len(pending)} pending halachot\n", flush=True)
     if args.limit:
         pending = pending[: args.limit]
 
@@ -369,6 +373,9 @@ if __name__ == "__main__":
     ap = argparse.ArgumentParser(description=__doc__,
                                  formatter_class=argparse.RawDescriptionHelpFormatter)
     ap.add_argument("--limit", type=int, default=0)
+    ap.add_argument("--case-number", default="",
+                    help="scope the panel to a single case's pending halachot "
+                         "(e.g. 8508-03-24); applied before --limit")
     ap.add_argument("--concurrency", type=int, default=6)
     ap.add_argument("--apply", action="store_true",
                     help="write the agreed verdicts (reversible, CSV-backed); default dry-run")