feat: #34 citation graph + #32 wide-modal precedent edit + #13 verify

## #34 — Daphna's internal citation graph

New schema V16 (V15 was already used by proceeding_type): table
``precedent_internal_citations`` (source→cited, with cited_case_law_id
nullable for citations whose target isn't in the corpus yet) + 3
indexes (source, target, unlinked).

New service ``citation_extractor.py`` with regex patterns for ערר /
בל"מ / עע"מ / בר"מ / עמ"נ / ע"א / בג"ץ / רע"א — accepts both ``\/``
and ``-`` separators, requires actual parenthesized district label
to avoid greedy mid-paragraph captures. Resolves citations against
``case_law.case_number`` substring; default confidence 0.90 linked,
0.75 unlinked. ON CONFLICT DO NOTHING on (source, cited_case_number).

3 new MCP tools: ``extract_internal_citations``,
``list_internal_citations``, ``list_incoming_citations``. Optional
flag ``include_cited_by=True`` on ``search_internal_decisions``
appends cited-by candidates as ``match_type='cited_by'`` stubs.

Bulk-extracted from 40 internal_committee rows authored by דפנה תמיר:
**353 distinct citations, 348 stored, 96 linked / 252 unlinked**.
Top citers: 1079/24 (30), 1024/24 (19), 1009/25 (18). Top unlinked
target: ע"א 3213/97 (cited 5x) — natural #35 candidates.

## #32 — Wide-modal precedent edit

`precedent-edit-sheet.tsx`: ``<Sheet side="left">`` → centered
``<Dialog>`` with ``sm:max-w-4xl`` ``max-h-[90vh]`` ``overflow-y-auto``.
Component API unchanged so existing callers
(`/precedents/[id]/page.tsx`, `library-list-panel.tsx`) work as-is.
RTL preserved. Mobile falls back to near-full-width via shadcn default.

## #13 — 403/17 verification

`case_law e151fc25-...` (אהרון ברק - תכנית רחביה) already in perfect
shape after Stage A work: all metadata fields populated, 351 halachot
with avg_conf=0.864 (well above 0.78 threshold). No re-extraction
needed; closing task as verified.

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

mcp-server/src/legal_mcp/tools/search.py

@@ -189,6 +189,7 @@ async def search_internal_decisions(
     chair_name: str = "",
     limit: int = 10,
     include_halachot: bool = True,
+    include_cited_by: bool = False,
 ) -> str:
     """חיפוש בהחלטות ועדות ערר לתכנון ובנייה (כל המחוזות).
 
@@ -200,42 +201,135 @@ async def search_internal_decisions(
         chair_name: שם יו"ר הוועדה לסינון. ריק = כל היו"רים
         limit: מספר תוצאות מקסימלי
         include_halachot: האם לכלול הלכות שחולצו
+        include_cited_by: True = אחרי החיפוש הראשי, הוסף החלטות שה-hits
+            הראשיים מצטטים (מתוך precedent_internal_citations). default False
+            כדי לא לשבור caller-ים קיימים. match_type='cited_by' מציין שזו
+            תוצאה משנית.
     """
     from legal_mcp.services import internal_decisions as int_svc
 
+    # Bump the limit a bit when we're expanding via citations — the
+    # citation step is cheap and a few extra primary hits make the
+    # expansion more useful.
+    primary_limit = limit if not include_cited_by else max(limit, limit * 2)
+
     results = await int_svc.search_internal(
         query,
         practice_area=practice_area,
         appeal_subtype=appeal_subtype,
         district=district,
         chair_name=chair_name,
-        limit=limit,
+        limit=primary_limit,
         include_halachot=include_halachot,
     )
 
     if not results:
         return "לא נמצאו החלטות ועדת ערר רלוונטיות."
 
+    # Cap primary results back to ``limit`` (we over-fetched only to seed
+    # the citation expansion below — the user asked for ``limit`` items).
+    primary = results[:limit]
+
     formatted = []
-    for r in results:
-        entry = {
-            "score": round(float(r["score"]), 4),
-            "type": r.get("type", "passage"),
-            "case_number": r.get("case_number"),
-            "case_name": r.get("case_name"),
-            "court": r.get("court"),
-            "district": r.get("district"),
-            "chair_name": r.get("chair_name"),
-            "decision_date": r.get("decision_date"),
-        }
-        if r.get("type") == "halacha":
-            entry["rule"] = r.get("rule_statement")
-            entry["quote"] = r.get("supporting_quote")
-            entry["rule_type"] = r.get("rule_type")
-        else:
-            entry["content"] = r.get("content", "")
-            entry["section"] = r.get("section_type")
-            entry["page"] = r.get("page_number")
-        formatted.append(entry)
+    seen_case_law_ids: set[str] = set()
+    for r in primary:
+        clid = str(r.get("case_law_id") or "")
+        if clid:
+            seen_case_law_ids.add(clid)
+        formatted.append(_format_internal_row(r, match_type="primary"))
+
+    if include_cited_by and seen_case_law_ids:
+        from uuid import UUID
+        from legal_mcp.services import citation_extractor
+
+        try:
+            source_uuids = [UUID(s) for s in seen_case_law_ids]
+            cited_map = await citation_extractor.get_cited_case_law_ids(source_uuids)
+        except Exception as e:
+            logger.warning("include_cited_by lookup failed: %s", e)
+            cited_map = {}
+
+        # Flatten + dedup the cited case_law_ids that aren't already in
+        # the primary set.
+        cited_ids: set[str] = set()
+        for ids in cited_map.values():
+            for cid in ids:
+                if cid and cid not in seen_case_law_ids:
+                    cited_ids.add(cid)
+
+        if cited_ids:
+            cited_rows = await _fetch_case_law_summaries(list(cited_ids))
+            for row in cited_rows:
+                formatted.append(_format_internal_row(row, match_type="cited_by"))
 
     return json.dumps(formatted, ensure_ascii=False, indent=2)
+
+
+def _format_internal_row(r: dict, *, match_type: str = "primary") -> dict:
+    """Shape an internal-decision hit (or a cited_by stub) for the MCP response."""
+    entry: dict = {
+        "score": round(float(r.get("score", 0.0)), 4),
+        "type": r.get("type", "passage"),
+        "case_number": r.get("case_number"),
+        "case_name": r.get("case_name"),
+        "court": r.get("court"),
+        "district": r.get("district"),
+        "chair_name": r.get("chair_name"),
+        "decision_date": r.get("decision_date"),
+        "match_type": match_type,
+    }
+    if r.get("type") == "halacha":
+        entry["rule"] = r.get("rule_statement")
+        entry["quote"] = r.get("supporting_quote")
+        entry["rule_type"] = r.get("rule_type")
+    else:
+        entry["content"] = r.get("content", "")
+        entry["section"] = r.get("section_type")
+        entry["page"] = r.get("page_number")
+    return entry
+
+
+async def _fetch_case_law_summaries(case_law_ids: list[str]) -> list[dict]:
+    """Pull lightweight metadata for a set of case_law UUIDs (cited-by stubs).
+
+    Doesn't pull chunks/halachot — the goal is to surface the existence of
+    the related precedent, not to repeat search. The caller can drill in
+    via search_internal_decisions with chair_name+case_number if they want
+    full passages.
+    """
+    from uuid import UUID
+    pool = await db.get_pool()
+    uuid_list = []
+    for s in case_law_ids:
+        try:
+            uuid_list.append(UUID(s))
+        except ValueError:
+            continue
+    if not uuid_list:
+        return []
+    async with pool.acquire() as conn:
+        rows = await conn.fetch(
+            """
+            SELECT id::text AS case_law_id,
+                   case_number,
+                   case_name,
+                   court,
+                   district,
+                   chair_name,
+                   date AS decision_date,
+                   headnote AS content
+              FROM case_law
+             WHERE id = ANY($1::uuid[])
+            """,
+            uuid_list,
+        )
+    out: list[dict] = []
+    for r in rows:
+        d = dict(r)
+        if d.get("decision_date") is not None:
+            d["decision_date"] = d["decision_date"].isoformat()
+        # Stub rows show up with score 0 — they're not ranked, they're context.
+        d["score"] = 0.0
+        d["type"] = "passage"
+        out.append(d)
+    return out