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Headers were built and rebuilt as "Mime-Version" rather than "MIME-Version". Both are valid per RFC 2045, but some spam filters, such as rspamd, score the mixed-case form as a deliverability signal. Fix the header name in the accessor macro and in ParsedHeader's grammar table, the places that spell it, and update the snapshot tests across mailparsing, message, kumo-log-types, mod-mimepart, and kumod that captured the old spelling, along with the reference docs that showed the old casing in their examples. #564