cairn/log/2026-07-27-raw-command-batch.md
Made imap raw and smtp raw forward their command bytes to the server verbatim, and taught imap raw to pipeline a whole batch. A raw command typed on the shell arrives with backslash escapes left literal (a1 NOOP\r\n reaches the process as the bytes \ r \ n, not a real CRLF), so both commands now resolve their argument through a shared RawCommandArg (in shared/raw.rs, mirroring MessageArg) that strips \r literals and turns \n literals into real CRLF, accepting the argument positionally or from stdin.
The underlying io-imap ImapRaw was reworked upstream to be a byte-verbatim batch passthrough: it no longer injects a tag or trims/appends CRLF, it parses the input to collect every command's tag, and it reads until all of them are acknowledged, tolerating out-of-order tagged completions (RFC 3501 §5.5). imap raw therefore sends a batch of caller-tagged commands separated by CRLF and appends a trailing CRLF when the last one omits it. smtp raw keeps io-smtp's single-command/single-reply model: it strips the trailing CRLF io-smtp adds itself and rejects a multi-line batch that would desync the reply parser.
Touched the commands capability (new "Raw passthrough is byte-verbatim" requirement). The io-imap change is a breaking rework of ImapRaw / ImapClientStd::raw (now impl AsRef<[u8]>, fallible new, new ImapRawError variants), pending an io-imap release before Himalaya can drop the published-crate path and adopt it.