Plain-TCP listener on 0.0.0.0 (handles both localhost and 127.0.0.1).
LOGIN, NOOP, SELECT (reloads inbox), FETCH header+body, SEARCH, STORE,
EXPUNGE (deletes on ProtonMail), LOGOUT.
FETCH body decrypts messages on demand: brief lock for ID lookup, API call
without lock, brief lock again for crypto. RFC 3501 literal format with
exact byte counts for imap-crate compatibility.
Also: update store.expunge() to return (ids, seqs) in descending order for
correct IMAP EXPUNGE response ordering; add chrono for RFC 2822 dates.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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