Add claim_type field: distinguish claims vs responses vs replies

Legal documents have 3 types of assertions:
- claim: from appeal documents (כתב ערר)
- response: from original responses (כתב תשובה)
- reply: from supplementary responses (תגובה, השלמת טיעון)

DB: added claim_type column to claims table
Extractor: _infer_claim_type() auto-detects from doc_type + title
Updated existing 113 records: 29 claims, 28 responses, 56 replies

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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

@@ -572,14 +572,15 @@ async def store_claims(case_id: UUID, claims: list[dict], source_document: str =
             )
         for claim in claims:
             await conn.execute(
-                """INSERT INTO claims (case_id, party_role, party_name, claim_text, claim_index, source_document)
-                   VALUES ($1, $2, $3, $4, $5, $6)""",
+                """INSERT INTO claims (case_id, party_role, party_name, claim_text, claim_index, source_document, claim_type)
+                   VALUES ($1, $2, $3, $4, $5, $6, $7)""",
                 case_id,
                 claim["party_role"],
                 claim.get("party_name", ""),
                 claim["claim_text"],
                 claim.get("claim_index", 0),
                 source_document,
+                claim.get("claim_type", "claim"),
             )
     return len(claims)