Newt-Agent ACP worker.
Speaks the Agent Client Protocol (agentclientprotocol.com) over stdio so
drake-foreman can dispatch coding goals to Newt instances.
Contract (per memory feedback_drake_patch_not_prose and
feedback_empty_diff_is_a_crash):
- Worker ONLY edits files; never
git add/git commit/git push. - Empty
git diffpost-turn is a deterministic crash — foreman counts it against the model's scorecard. TaskReply.model_idis mandatory.