feat: implement hybrid encryption for message hash with 500-byte limit#646

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onahprosper wants to merge 7 commits intomainfrom

feature/hybrid-encryption-for-message-hash

Commits on Jan 14, 2026

feat: add backward compatibility for message hash decryption with hybrid and legacy formats
onahprosper
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fix: skip backward compatibility tests if aggregator keys are not configured
onahprosper
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fix: update skip message for backward compatibility test to clarify context
onahprosper
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