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837ae2bf7f
`handler: str | None` was optional and opaque — missing handlers only surfaced at kickoff time. `do: FlowActionDefinition` is required, so Pydantic rejects invalid definitions at parse time. The `call: "code"` discriminator prepares the schema for future non-Python action types (e.g. MCP tool, crew) without touching `FlowMethodDefinition`. Resolution logic is extracted to `runtime/_action_resolvers.py` to keep the dispatch point isolated.