feat: add internal committee decisions corpus (source_kind='internal_committee')

Three-layer separation: style learning (style_corpus), appeals-committee decisions
(internal_committee), and court rulings (external_upload).

- SCHEMA_V10: chair_name + district columns on case_law and cases, partial indexes
- create_internal_committee_decision() DB upsert function
- search_precedent_library_semantic() now accepts source_kind/district/chair_name params
- search_precedent_library_hybrid() passes through new params
- services/internal_decisions.py: ingest_internal_decision, migrate_from_style_corpus,
  migrate_from_external_corpus (identifies rows via source_type='appeals_committee')
- search_internal_decisions() MCP tool (server.py + tools/search.py)
- internal_decision_migrate() MCP admin tool
- Web endpoints: POST /api/internal-decisions/upload, POST /api/internal-decisions/migrate,
  GET /api/internal-decisions
- ingest_final_version auto-ingests finalized decisions into internal corpus
- SKILL.md updated: agents now search internal + external in parallel, present separately

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

mcp-server/src/legal_mcp/server.py

@@ -390,6 +390,35 @@ async def find_similar_cases(
     )
 
 
+@mcp.tool()
+async def search_internal_decisions(
+    query: str,
+    practice_area: str = "",
+    appeal_subtype: str = "",
+    district: str = "",
+    chair_name: str = "",
+    limit: int = 10,
+    include_halachot: bool = True,
+) -> str:
+    """חיפוש בהחלטות ועדות ערר לתכנון ובנייה (כל המחוזות).
+
+    מחזיר החלטות מהקורפוס הפנימי של ועדות הערר — נפרד מפסיקת בתי המשפט.
+    השתמש בו במקביל ל-search_precedent_library להצגת שתי שכבות נפרדות.
+
+    Args:
+        query: שאילתת חיפוש בעברית
+        practice_area: rishuy_uvniya / betterment_levy / compensation_197
+        appeal_subtype: סינון לפי תת-סוג ערר
+        district: מחוז — ירושלים / מרכז / תל אביב / צפון / דרום / ארצי. ריק = כל המחוזות
+        chair_name: שם יו"ר הוועדה לסינון. ריק = כל היו"רים
+        limit: מספר תוצאות מקסימלי
+        include_halachot: האם לכלול הלכות שחולצו
+    """
+    return await search.search_internal_decisions(
+        query, practice_area, appeal_subtype, district, chair_name, limit, include_halachot,
+    )
+
+
 # Drafting
 @mcp.tool()
 async def get_style_guide() -> str:
@@ -573,6 +602,28 @@ async def ingest_final_version(
     return await workflow.ingest_final_version(case_number, file_path, final_text)
 
 
+@mcp.tool()
+async def internal_decision_migrate(
+    source: str = "both",
+    dry_run: bool = True,
+) -> str:
+    """העברת החלטות ועדת ערר קיימות לקורפוס הפנימי (פעולת admin).
+
+    source: 'style_corpus' | 'external_corpus' | 'both'
+    dry_run: אם true — מציג מה יקרה ללא כתיבה
+    """
+    import json as _json
+    from legal_mcp.services import internal_decisions as int_svc
+    if source not in {"style_corpus", "external_corpus", "both"}:
+        return "source חייב להיות style_corpus / external_corpus / both"
+    results: dict = {}
+    if source in {"style_corpus", "both"}:
+        results["style_corpus"] = await int_svc.migrate_from_style_corpus(dry_run=dry_run)
+    if source in {"external_corpus", "both"}:
+        results["external_corpus"] = await int_svc.migrate_from_external_corpus(dry_run=dry_run)
+    return _json.dumps(results, ensure_ascii=False, indent=2)
+
+
 @mcp.tool()
 async def record_chair_feedback(
     case_number: str,