1d89e0ff8d
Add granular developer guide for BaseRunner and InMemoryRunner covering session lifecycle resolution, RunConfig, and event streaming under docs/guides/runners/runner/index.md, and real-time bidirectional streaming with run_live and LiveRequestQueue under docs/guides/runners/runner/live.md. Co-authored-by: Shangjie Chen <deanchen@google.com> PiperOrigin-RevId: 968085075