docs: add Generation Module documentation comments

app.py

@@ -256,6 +256,7 @@ Code to review:
 
 # ---------------------------------------------------------------------------
 # MODULE 4 — Generation Module
+# Responsible for communicating with Gemini 2.5 Flash and generating
 # ---------------------------------------------------------------------------
 def generate_response(prompt: str, retries: int = 3, initial_delay: float = 1.5) -> dict:
     delay = initial_delay