fix: Handle missing crew_team_key column in agents query

- Remove crew_team_key from SELECT (column doesn't exist)
- Use pop() to safely handle crew_team_key in data processing
- This fixes 500 error on /api/agents/list endpoint

services/city-service/repo_city.py

@@ -435,7 +435,6 @@ async def list_agent_summaries(
             pm.slug AS primary_microdao_slug,
             pm.district AS district,
             COALESCE(a.public_skills, ARRAY[]::text[]) AS public_skills,
-            a.crew_team_key,
             -- DAIS & Governance fields (A1, A2)
             a.gov_level,
             a.dais_identity_id,
@@ -497,8 +496,9 @@ async def list_agent_summaries(
         
         data["public_skills"] = list(data.get("public_skills") or [])
         
-        # Populate crew_info
-        if data.get("crew_team_key"):
+        # Populate crew_info (crew_team_key column may not exist)
+        crew_team_key = data.pop("crew_team_key", None)
+        if crew_team_key:
             # Try to find orchestrator team room for their primary microdao
             # This is a bit expensive for list view, so maybe just return basic info
             data["crew_info"] = {