fix(ai): preserve numeric status field in RUN_ERROR payloads

[jan-kubica]

toRunErrorPayload dropped the HTTP status for SDK error classes that report it only as a numeric status field with no code (e.g. Google's @google/genai ApiError), leaving RUN_ERROR events with code: undefined and making 401/403/404/429 indistinguishable from unknown failures. Fall back to a numeric status when no code is present; ignore a string status (reason phrase / symbolic status) so only the numeric HTTP code is forwarded.

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