Mirror agent_artifact in CreateSessionParams

[abonneth]

Made with Cursor

---

Note

Low Risk
Typing-only mirror of an existing API field; no runtime logic changes.

Overview
Adds agent_artifact to the CreateSessionParams TypedDict so it matches SessionRequest and the generated create_session API.

Callers can pass agent_artifact into run_session / async_run_session with correct typing and IDE autocomplete; kwargs still flow through to create_session unchanged.

^{Reviewed by Cursor Bugbot for commit e1f0fd1. Bugbot is set up for automated code reviews on this repo. Configure here.}

[abonneth]

agent_artifact is an internal deployment pin and shouldn't be in the public surface at all; it will be stripped from the public OpenAPI schema in agent_platform instead, and the next SDK regen will drop it from the generated client.