Fix ResponseValidationError: change response field to content

FastAPI validation was failing because stage1 results used 'response'
field but Pydantic expected 'content'. Changed field name in:
- stage1_collect_responses: returns content instead of response
- stage2_collect_rankings: references result['content']
- stage3_synthesize_final: references result['content']
- MCP server: reads resp.get("content", "") for content_blocks

backend/council.py

@@ -26,7 +26,7 @@ async def stage1_collect_responses(user_query: str) -> List[Dict[str, Any]]:
         if response is not None:  # Only include successful responses
             stage1_results.append({
                 "model": model,
-                "response": response.get('content', '')
+                "content": response.get('content', '')
             })
 
     return stage1_results
@@ -57,7 +57,7 @@ async def stage2_collect_rankings(
 
     # Build the ranking prompt
     responses_text = "\n\n".join([
-        f"Response {label}:\n{result['response']}"
+        f"Response {label}:\n{result['content']}"
         for label, result in zip(labels, stage1_results)
     ])
 
@@ -130,7 +130,7 @@ async def stage3_synthesize_final(
     """
     # Build comprehensive context for chairman
     stage1_text = "\n\n".join([
-        f"Model: {result['model']}\nResponse: {result['response']}"
+        f"Model: {result['model']}\nResponse: {result['content']}"
         for result in stage1_results
     ])
 

mcp_server/server.py

@@ -145,7 +145,7 @@ async def council_query(
             "type": "council_response",
             "model": model_id,
             "model_display_name": get_display_name(model_id),
-            "response": resp.get("response", ""),
+            "response": resp.get("content", ""),
             "stage": 1
         })