fix(startup): lazy-init root_agent in lifespan — fix Cloud Run startup probe

agents/core-logic/agent.py

@@ -263,9 +263,6 @@ def build_agent(mode: str = "light", message: str = "") -> tuple:
     return agent, actual_model, instruction
 
 
-root_agent, _, _ = build_agent(mode="light")
-
-
 async def _run_async(message: str, user_id: str, session_id: str, mode: str, caller_type: str = "agent") -> str:
     mode = _normalize_mode(mode)
     agent, actual_model, instruction = build_agent(mode=mode, message=message)

agents/core-logic/app.py

@@ -21,7 +21,7 @@ try:
     from google.adk.runners import Runner
     from google.adk.sessions import InMemorySessionService
     from google.genai.types import Content, Part
-    from agent import root_agent
+    from agent import build_agent
     from agents.recommendations_engine import get_recommendations
     from token_logger import create_bq_table_if_not_exists
 except ImportError as e:
@@ -29,6 +29,7 @@ except ImportError as e:
     raise
 
 session_service = InMemorySessionService()
+root_agent = None
 APP_NAME           = os.environ.get("CLOUD_RUN_SERVICE", "gcp-orchestrator")
 PROJECT_ID         = os.environ.get("GOOGLE_CLOUD_PROJECT", "propane-will-491900-m5")
 BQ_BILLING_DATASET = os.environ.get("BQ_BILLING_DATASET", "billing_data")
@@ -42,9 +43,11 @@ _budget_store: dict = {}
 
 @asynccontextmanager
 async def lifespan(app: FastAPI):
+    global root_agent
     logger.info(f"OSVauco agent '{APP_NAME}' starting up")
     vertexai.init(project=PROJECT_ID, location=os.environ.get("GOOGLE_CLOUD_LOCATION", "us-central1"))
     create_bq_table_if_not_exists()
+    root_agent, _, _ = build_agent(mode="light")
     logger.info(f"Static dir: {STATIC_DIR} (exists={STATIC_DIR.exists()})")
     yield
     logger.info(f"OSVauco agent '{APP_NAME}' shutting down")