New mode='chat' with system_prompt + user_prompt inputs runs your own prompt over
the image(s) and returns raw text in 'analysis' — reusing the same model dropdown,
quant, auto-download and backend. Makes it a one-node abliterated VLM for captioning,
tagging, Q&A, prompt-from-image, etc. agent_bridge gains --mode chat /
--system-prompt / --user-prompt (no receptor needed). Writes a chat report
(latest.json) for the agent. Docs updated.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>