A folder baked by Python's functai.bake (or by a trainer that wrote
baked.json format 2), its weights served at url by an OpenAI-compatible
server (vllm serve <folder>/model serves /v1/chat/completions).
update(fn, lm = baked(...)) runs fn on it, laid out exactly as it was
trained: the student's signature and layout, no worked examples, thinking
off. A call is refused when fn changed since it was baked
(baked-changed), or gives a fixed input another value (baked-fixed) or
a derived one a pair the student never saw (baked-derived).