fix(mma): Assign dedicated models per tier in execute_agent

scripts/mma_exec.py

@@ -2,26 +2,36 @@ import argparse
 import subprocess
 import json
 
+def get_model_for_role(role: str) -> str:
+    """Returns the specific model to use for a given tier role."""
+    if role == 'tier1-orchestrator' or role == 'tier1':
+        return 'gemini-3.1-pro-preview'
+    elif role == 'tier2-tech-lead' or role == 'tier2':
+        return 'gemini-3.0-flash-preview'
+    else:
+        return 'gemini-2.5-flash-lite'
+
 def get_role_documents(role: str) -> list[str]:
-    if role == 'tier1':
+    if role == 'tier1-orchestrator' or role == 'tier1':
         return ['conductor/product.md', 'conductor/product-guidelines.md']
-    elif role == 'tier2':
+    elif role == 'tier2-tech-lead' or role == 'tier2':
         return ['conductor/tech-stack.md', 'conductor/workflow.md']
-    elif role == 'tier3':
+    elif role == 'tier3-worker' or role == 'tier3':
         return ['conductor/workflow.md']
     return []
 
 def execute_agent(role: str, prompt: str, docs: list[str]) -> str:
+    model = get_model_for_role(role)
     command_text = f"Activate the mma-{role} skill. {prompt}"
     for doc in docs:
         command_text += f" @{doc}"
     
-    cmd = ['gemini', '-p', command_text, '--output-format', 'json', '--model', 'gemini-2.5-flash-lite']
+    cmd = ['gemini', '-p', command_text, '--output-format', 'json', '--model', model]
     try:
         process = subprocess.run(cmd, capture_output=True, text=True, shell=True)
         if not process.stdout and process.stderr:
             return f"Error: {process.stderr}"
-            
+
         stdout = process.stdout
         start_index = stdout.find('{')
         if start_index != -1:
@@ -39,7 +49,7 @@ def create_parser():
     parser = argparse.ArgumentParser(description="MMA Execution Script")
     parser.add_argument(
         "--role", 
-        choices=['tier1', 'tier2', 'tier3', 'tier4'], 
+        choices=['tier1', 'tier2', 'tier3', 'tier4', 'tier1-orchestrator', 'tier2-tech-lead', 'tier3-worker', 'tier4-qa'], 
         required=True, 
         help="The tier role to execute"
     )