fix(conductor): Apply review suggestions for track 'python_style_refactor_20260227'

aggregate.py

@@ -1,4 +1,5 @@
 # aggregate.py
+from __future__ import annotations
 """
 Note(Gemini):
 This module orchestrates the construction of the final Markdown context string. 

ai_client.py

@@ -1,4 +1,5 @@
 # ai_client.py
+from __future__ import annotations
 """
 Note(Gemini):
 Acts as the unified interface for multiple LLM providers (Anthropic, Gemini).

gui_2.py

@@ -1,4 +1,5 @@
 # gui_2.py
+from __future__ import annotations
 import tomli_w
 import threading
 import asyncio

scripts/ai_style_formatter.py

@@ -1,3 +1,4 @@
+from __future__ import annotations
 import tokenize
 import io
 import os

scripts/mma_exec.py

@@ -62,9 +62,9 @@ def get_model_for_role(role: str) -> str:
  if role == 'tier1-orchestrator' or role == 'tier1':
   return 'gemini-3.1-pro-preview'
  elif role == 'tier2-tech-lead' or role == 'tier2':
-  return 'gemini-3-flash-preview'
+  return 'gemini-2.5-flash-lite'
  elif role == 'tier3-worker' or role == 'tier3':
-  return 'gemini-3-flash-preview'
+  return 'gemini-2.5-flash-lite'
  elif role == 'tier4-qa' or role == 'tier4':
   return 'gemini-2.5-flash-lite'
  else: