Pydantic AI v2.36.0 opens durable execution to third-party engines with a public backend API

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Released 2026-08-29, v2.36.0 adds `@durable_operation` for capabilities plus a documented public backend API so durable execution engines other than the bundled ones can plug in (#6696), and requires an explicit operation name on the decorator (#7868). The `clai` CLI gains `--mcp-config` support and tool-call streaming, flagged as a compatibility note (#1374), and instruction parts get a stable `InstructionPart.id` (#6887). A bug fix projects a bare `ToolDefinition` into Prefect cache keys, which matters if you were getting cache collisions across differently-defined tools.