Lets the AI search Apple Mail, read a message, and save an attachment to
disk (e.g. to hand off to paperless_upload_document) — e.g. "find the
receipt from Elkjøp and add it to Paperless." Talks to Mail.app via
AppleScript/Apple Events rather than parsing its private on-disk store,
so no Full Disk Access or MIME parsing is needed; Mail's own attachment
save handles all decoding. Every mail_* tool call requires approval
(Deny/Allow Once/Allow for Session), mirroring the bash_execute and
Personal Data gate pattern.
Also fixes a pre-existing bug found while touching the adjacent
tool-activation condition: paperlessEnabled was missing from it, so
Paperless tools could fail to activate unless another integration was
also active.