fix: ADK 1.x Runner pattern + gemini-3.5-flash for A+ reasoning

agents/core-logic/agent.py

@@ -4,7 +4,8 @@ agent.py — OSVauco root agent using ADK 1.x with A / A+ mode routing.
 
 Modes:
   A   (standard) — gemini-2.0-flash, $1/task hard stop
-  A+  (audit+)   — gemini-2.5-pro orchestrator, $3/task hard stop,
+  A+  (audit+)   — gemini-2.5-pro orchestrator + subagents,
+                    gemini-3.5-flash reasoning, $3/task hard stop,
                     multi-agent pipeline enabled
 
 Authorized users for A+: opax, admin
@@ -13,11 +14,15 @@ Requires: google-adk >= 1.0.0,<2.0.0
          google-cloud-aiplatform >= 1.112.0
 """
 
+import asyncio
 import os
 import logging
 from typing import Literal
 
 from google.adk.agents import Agent
+from google.adk.runners import Runner
+from google.adk.sessions.in_memory_session_service import InMemorySessionService
+from google.genai import types
 
 logger = logging.getLogger(__name__)
 
@@ -37,7 +42,7 @@ REASONING_MODEL      = os.environ.get("REASONING_MODEL",     "gemini-2.0-flash")
 # A+ (audit+) models
 HEAVY_ORCHESTRATOR = os.environ.get("HEAVY_ORCHESTRATOR_MODEL", "gemini-2.5-pro")
 HEAVY_SUBAGENT     = os.environ.get("HEAVY_SUBAGENT_MODEL",     "gemini-2.5-pro")
-HEAVY_REASONING      = os.environ.get("HEAVY_REASONING_MODEL",    "gemini-2.5-flash")
+HEAVY_REASONING    = os.environ.get("HEAVY_REASONING_MODEL",    "gemini-3.5-flash")  # NOT 2.5-flash
 
 # Budget hard stops (USD per task)
 BUDGET_A     = float(os.environ.get("BUDGET_A_USD_PER_TASK",         "1.0"))
@@ -46,6 +51,7 @@ BUDGET_APLUS         = float(os.environ.get("HEAVY_MODE_BUDGET_USD_PER_DAY", "3.
 HEAVY_MODE_ALLOWED_USERS = ["opax", "admin"]
 
 Mode = Literal["A", "A+"]
+APP_NAME = "opax"
 
 
 # ---------------------------------------------------------------------------
@@ -138,9 +144,48 @@ root_agent = build_agent(mode="A")
 
 
 # ---------------------------------------------------------------------------
-# run() — programmatic entry point for Cloud Run /run endpoint
+# run() — async core, sync wrapper for Cloud Run /run endpoint
 # ---------------------------------------------------------------------------
 
+async def _run_async(
+    message: str,
+    user_id: str,
+    session_id: str,
+    mode: Mode,
+) -> str:
+    """Async implementation using ADK 1.x Runner pattern."""
+    agent = build_agent(mode=mode)
+    session_service = InMemorySessionService()
+
+    session = await session_service.create_session(
+        app_name=APP_NAME,
+        user_id=user_id,
+        session_id=session_id,
+    )
+
+    runner = Runner(
+        agent=agent,
+        app_name=APP_NAME,
+        session_service=session_service,
+    )
+
+    new_message = types.Content(
+        role="user",
+        parts=[types.Part(text=message)],
+    )
+
+    final_text = ""
+    async for event in runner.run_async(
+        user_id=user_id,
+        session_id=session.id,
+        new_message=new_message,
+    ):
+        if event.is_final_response() and event.content and event.content.parts:
+            final_text = event.content.parts[0].text or ""
+
+    return final_text
+
+
 def run(
     message: str,
     user_id: str = "opax",
@@ -160,7 +205,7 @@ def run(
         Agent response as a string.
 
     Raises:
-        PermissionError: If user_id is not authorized for the requested mode.
+        PermissionError: If user_id is not authorized for A+ mode.
         ValueError:      If mode is not 'A' or 'A+'.
     """
     if mode not in ("A", "A+"):
@@ -168,13 +213,12 @@ def run(
 
     authorize_mode(user_id, mode)
 
-    agent = build_agent(mode=mode)
-    response = agent.run(
+    return asyncio.run(_run_async(
         message=message,
-        session_id=session_id,
         user_id=user_id,
-    )
-    return response.text if hasattr(response, "text") else str(response)
+        session_id=session_id,
+        mode=mode,
+    ))
 
 
 # ---------------------------------------------------------------------------
@@ -183,6 +227,7 @@ def run(
 
 if __name__ == "__main__":
     import sys
+    logging.basicConfig(level=logging.WARNING)
 
     query          = sys.argv[1] if len(sys.argv) > 1 else "Hva er OPAX A+ mode?"
     requested_mode = sys.argv[2] if len(sys.argv) > 2 else "A"