fix(agent-office): bookmark field name + service_proxy contract + mktemp

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

agent-office/tests/test_realestate_agent.py

@@ -2,7 +2,9 @@ import os
 import sys
 import tempfile
 
-_TMP = tempfile.mktemp(suffix=".db")
+_fd, _TMP = tempfile.mkstemp(suffix=".db")
+os.close(_fd)
+os.unlink(_TMP)
 os.environ["AGENT_OFFICE_DB_PATH"] = _TMP
 
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))