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Module invoke

durable_lambda_core::operations

Module invoke 

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Invoke operation — durable Lambda-to-Lambda invocation.

Implement FR17-FR18: invoke target function, checkpoint result for replay.

The invoke operation sends a single START checkpoint with the serialized payload and target function name. The server invokes the target Lambda asynchronously and transitions the operation to SUCCEEDED/FAILED when done. The wire type is ChainedInvoke (matching the Python SDK).