durable: extract trace context from checkpoints and input payload

[joeyzhao2018]

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[chatgpt-codex-connector]

Guard non-dict InitialExecutionState before reading Operations

_durable_operations assumes event["InitialExecutionState"] is a dict and immediately chains .get("Operations"); if that field is null or any non-dict value, this raises AttributeError and aborts durable trace extraction instead of falling back to other context sources. This is a regression path introduced by the new durable extractor and can disable tracing for malformed or partially-populated durable events that still include DurableExecutionArn.

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