Amarula.Protocol.Signal.DecryptError exception (amarula v0.4.1)

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Expected decryption failure (bad MAC, wrong/closed chain, version mismatch).

This is the trial-decrypt signal: SessionCipher.decrypt_whisper_message/3 tries each session in the record and moves to the next one only on this error — programming errors (KeyError, MatchError, ...) propagate instead of being misread as "wrong session".