Add Temporal Operation Handler#1503
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What was changed
Added support for Temporal-backed Nexus operation handlers.
This introduces
@temporalio.nexus.temporal_operation,TemporalNexusClient, andTemporalOperationResult, allowing Nexus operation handlers to either return a synchronous result or start a Temporal workflow as the async backing operation. The branch also adds token parsing support for generic operation tokens, cancellation support for Temporal-backed workflow operations, Nexus workflow client overloads for the new operation shape, and focused runtime/type coverage.Why?
This gives Nexus operation handlers a first-class way to interact with Temporal while preserving Nexus async operation semantics, workflow linking/callback behavior, cancellation handling, and typed workflow-start ergonomics.
Checklist
How was this tested:
Any docs updates needed?
Yes. The Nexus docs should cover
@temporalio.nexus.temporal_operation,TemporalNexusClient.start_workflow,TemporalOperationResult.sync, and async workflow-backed operation behavior.