Serdes Recoverable Errors

[yaythomas]

Context

Implement handling of recoverable errors in serialization/deserialization operations to improve reliability and user experience.

This is actually already done, but should align with Task 15, when revisiting final error naming.

Technical Requirements

• Serdes errors terminate execution immediately by raising unhandled exception. The backend will retry these.
• Serdes actually already does this by throwing a FatalError.

Implementation Details

• File: src/aws_durable_execution_sdk_python/serdes.py
• Error Types: Network errors, temporary service issues, format errors
• Recovery Strategy: Retry with backoff for recoverable errors

Acceptance Criteria

• Recoverable errors are properly identified
• Retry logic implemented for recoverable errors
• Non-recoverable errors fail fast with clear messages
• Data integrity maintained during recovery
• Error classification is well-documented

Priority: Low
Estimated Effort: 0.5 days