Add DKIM signing for RSA and Ed25519. - #1
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Extract shared canonicalization so signing and verification reduce messages the same way, and pin both algorithms to the RFC 8463 sample signatures.
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Summary
MailAuth::Dkim.sign/Signerwithrelaxed/relaxed, key-derived algorithm (RSA or Ed25519), and oversigning by defaultCanonicalizationso signing and verification share RFC 6376 §3.4