Fixes#2234
The placeholder '(No response generated)' was overwriting the actual
final_response, causing it to be delivered to Discord even when the
agent completed work silently via tools.
Changes:
- Separate logged_response for output template display
- Keep final_response clean (empty when agent has no text)
- Delivery logic now correctly skips when final_response is empty
Test added to verify empty response stays empty for delivery.
Co-authored-by: Bartok9 <bartokmagic@proton.me>
c01cfe4f9a