feat(precedents): metadata auto-fill, edit sheet, persuasive extraction

Three improvements to the precedent library based on usage feedback:

1. Auto-fill metadata at upload time. New service
   precedent_metadata_extractor reads the ruling's full_text and
   suggests case_name (short), summary, headnote, key_quote,
   subject_tags, appeal_subtype. The merge policy fills only empty
   fields, preserving everything the chair typed in the upload form.
   Wired into the ingest pipeline; also exposed as a re-run endpoint
   POST /api/precedent-library/{id}/extract-metadata for existing
   records.

2. Edit sheet in the UI. Pencil icon on each library row opens a
   pre-populated form covering every field. A Sparkles button on the
   sheet runs the metadata extractor on demand and refreshes the
   form. The case_number is read-only because halachot are FK'd to
   it; renaming requires delete + re-upload.

3. Halacha extractor branches on is_binding. Sources marked binding
   (Supreme/Administrative) keep the strict halacha prompt. Non-binding
   sources (other appeals committees, district courts on planning
   matters) get a different prompt that extracts applications,
   interpretive principles, and persuasive conclusions — labeled with
   new rule_types 'application' and 'persuasive'. The fallback also
   widens chunk selection: if the chunker labeled nothing as
   legal_analysis/ruling/conclusion, we now run on all chunks rather
   than returning zero halachot for a usable ruling.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.taskmaster/tasks/tasks.json

@@ -1089,13 +1089,79 @@
         "priority": "medium",
         "subtasks": [],
         "updatedAt": "2026-05-03T08:36:24.711Z"
+      },
+      {
+        "id": "9",
+        "title": "Service: precedent_metadata_extractor.py",
+        "description": "LLM-based extractor that auto-fills empty metadata fields after upload: short case_name (e.g. 'אהרון ברק' from long citation), summary (2-3 sentences), headnote, key_quote, subject_tags array, appeal_subtype. Reuses claude_session.query_json. Returns dict; caller decides which empty fields to merge (never overrides user values).",
+        "details": "",
+        "testStrategy": "",
+        "status": "done",
+        "dependencies": [],
+        "priority": "high",
+        "subtasks": [],
+        "updatedAt": "2026-05-03T10:19:15.105Z"
+      },
+      {
+        "id": "10",
+        "title": "Halacha extractor: dual mode (binding vs persuasive)",
+        "description": "Update halacha_extractor.py prompt to branch on is_binding: binding=true → strict halacha extraction (current). binding=false → extract reasoning principles, applications of established halachot, persuasive conclusions. New rule_types: 'application' (applying known rule to facts), 'persuasive' (committee's reasoning citable as authority). Schema unchanged (rule_type already TEXT).",
+        "details": "",
+        "testStrategy": "",
+        "status": "done",
+        "dependencies": [],
+        "priority": "high",
+        "subtasks": [],
+        "updatedAt": "2026-05-03T10:19:15.117Z"
+      },
+      {
+        "id": "11",
+        "title": "Ingest pipeline: add metadata extraction stage",
+        "description": "In services/precedent_library.py:ingest_precedent, after halacha extraction, run metadata_extractor and PATCH the case_law row with auto-filled fields (only those left empty by user). Publish progress 'extracting_metadata'.",
+        "details": "",
+        "testStrategy": "",
+        "status": "done",
+        "dependencies": [
+          "9"
+        ],
+        "priority": "high",
+        "subtasks": [],
+        "updatedAt": "2026-05-03T10:19:15.128Z"
+      },
+      {
+        "id": "12",
+        "title": "UI: precedent edit sheet",
+        "description": "Add edit button to library-list-panel rows that opens a Sheet with all editable fields (case_name, citation, court, date, practice_area, appeal_subtype, subject_tags, summary, headnote, key_quote, source_type, precedent_level, is_binding). Pre-populated from current values. Submit calls PATCH /api/precedent-library/{id} via useUpdatePrecedent. After save, invalidate library list query.",
+        "details": "",
+        "testStrategy": "",
+        "status": "done",
+        "dependencies": [],
+        "priority": "high",
+        "subtasks": [],
+        "updatedAt": "2026-05-03T10:19:15.134Z"
+      },
+      {
+        "id": "13",
+        "title": "Test on 403-17: fix metadata + re-extract",
+        "description": "After deploy: PATCH 403-17 to set case_name='ערר 403/17', then trigger precedent_extract_halachot to test the dual-mode extraction on a non-binding committee decision.",
+        "details": "",
+        "testStrategy": "",
+        "status": "pending",
+        "dependencies": [
+          "9",
+          "10",
+          "11",
+          "12"
+        ],
+        "priority": "medium",
+        "subtasks": []
       }
     ],
     "metadata": {
       "version": "1.0.0",
-      "lastModified": "2026-05-03T08:36:24.711Z",
-      "taskCount": 8,
-      "completedCount": 8,
+      "lastModified": "2026-05-03T10:19:15.134Z",
+      "taskCount": 13,
+      "completedCount": 12,
       "tags": [
         "legal-ai"
       ]