feat(appkit): one chat integration#386
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Both endpoints now share a single _handleInvoke that runs the agent once and returns an OpenAI Responses-shaped JSON envelope. The legacy SSE behavior of /invocations is removed; streaming consumers should move to POST /chat. A pre-flight HITL gate rejects (HTTP 400) any agent that exposes approval-required tools (effect: write/update/ destructive or destructive: true), since non-streaming invocation cannot run mid-call approval. The same rate-limit and thread-store seeding logic from the streaming path is reused. dev-playground gains a dependency-free responses_smoke agent (echo tool) plus README curl recipes mirroring the OneChat Scala client body shape, so /responses can be smoke-tested end-to-end against a deployed Databricks App.
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Why
The OneChat platform integrates with AppKit agent apps by calling
POST <app-url>/responsesat the root level, sending the OpenAI Responses API request shape, and expecting a single JSON envelope back (not SSE). Until this PR, AppKit only exposedPOST /invocations(SSE), so OneChat got404 Cannot POST /responsesfrom Express and had no compatible single-shot endpoint to consume.This integration doesn't support HITL either so we handle that too.