docs: Add session debrief about test fixes and MCP tool lesson

fix_provider2.py

@@ -0,0 +1,22 @@
+with open("src/orchestrator_pm.py", "r", encoding="utf-8", newline="") as f:
+    content = f.read()
+
+# Fix the provider/model setting in generate_tracks
+old = """# Ensure we use the current provider from ai_client state
+ current_provider = ai_client.get_provider()
+ current_model = ai_client._model if hasattr(ai_client, '_model') else 'gemini-2.5-flash-lite'
+ ai_client.set_provider(current_provider, current_model)"""
+
+new = """# Ensure we use the current provider from ai_client state
+ # Import ai_client module-level to access globals
+ import src.ai_client as ai_client_module
+ current_provider = ai_client_module._provider
+ current_model = ai_client_module._model
+ ai_client.set_provider(current_provider, current_model)"""
+
+content = content.replace(old, new)
+
+with open("src/orchestrator_pm.py", "w", encoding="utf-8", newline="") as f:
+    f.write(content)
+
+print("Fixed provider/model in orchestrator_pm.py")