Every emit/pull/push/receive now logs to the ComfyUI console with channel,
text preview, image path, and seed. comfy_push validates the sender's input and
emits clear '⚠ SENDER PROBLEM' warnings (also returned to the agent) when an
image_path doesn't exist on the host, a wrong type is passed, or the message is
empty. Agent Receive logs each step and, instead of crashing on a bad/missing
image path, logs exactly what the sender got wrong and falls back to a blank
image. Helps diagnose 'error when receiving' caused by the sender.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
