Add chair feedback system and content checklists for block-yod

Backend changes cherry-picked from ui-rewrite branch to enable
feedback API endpoints for the Next.js staging UI.

- chair_feedback DB table + API endpoints (GET/POST/PATCH)
- Content checklists by appeal subtype injected into block-yod prompt
- MCP tools for recording and listing chair feedback
- Corpus analysis documentation (24 decisions)

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

mcp-server/src/legal_mcp/server.py

@@ -390,6 +390,29 @@ async def ingest_final_version(
     return await workflow.ingest_final_version(case_number, file_path, final_text)
 
 
+@mcp.tool()
+async def record_chair_feedback(
+    case_number: str,
+    feedback_text: str,
+    block_id: str = "block-yod",
+    category: str = "missing_content",
+    lesson_extracted: str = "",
+) -> str:
+    """תיעוד הערת יו"ר (דפנה) על טיוטת החלטה — חסר, שגיאה, סגנון."""
+    return await workflow.record_chair_feedback(
+        case_number, feedback_text, block_id, category, lesson_extracted,
+    )
+
+
+@mcp.tool()
+async def list_chair_feedback(
+    case_number: str = "",
+    category: str = "",
+    unresolved_only: bool = True,
+) -> str:
+    """הצגת הערות יו"ר שתועדו — אפשר לסנן לפי תיק, קטגוריה, מטופלות."""
+    return await workflow.list_chair_feedback(case_number, category, unresolved_only)
+
 
 def main():
     mcp.run(transport="stdio")