Serves POST /v1/chat/completions on 127.0.0.1 and forwards each request to
an agent CLI installed on the machine.
The point: half the AI tooling out there speaks one dialect — OpenAI chat
completions — and exposes a configurable base_url. Meanwhile, the
subscriptions you already pay for (ChatGPT Plus/Pro, Claude, Cursor) live
inside a terminal with no HTTP endpoint at all. This bridges the two, so any
OpenAI-speaking application can drive a CLI-bound subscription without an API