b370fc00d1
Add granular developer guide for BaseCodeExecutor covering architecture, execution flow, backend environments (BuiltIn, UnsafeLocal, Container, GKE gVisor, Vertex AI, Agent Engine), delimiter extraction, and error retry loops under docs/guides/code_executors/code_executor/index.md. Co-authored-by: Shangjie Chen <deanchen@google.com> PiperOrigin-RevId: 967423934