Add signal-with-start serialization context metadata - #73
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Summary
Why
Signal-with-start envelopes contain payloads destined for the target workflow. The SDK needs generated metadata that derives the target workflow serialization context from the typed request, instead of using the context-free Nexus default.
SDK integration
Consumed by temporalio/sdk-python#1672, which applies this metadata only while scheduling Temporal system-Nexus operations.
Validation
basedpyrightagainst the local SDK branch: 0 errors, 0 warnings