keychain's GPG key management is incompatible with GnuPG 2.4 keyboxd.
gpg-agent handles key caching natively; set 24h TTL so it unlocks once per day.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Documents the full Outlook.com OAuth2 mail setup (rbw, Azure app registration,
GPG, mutt-oauth2, mbsync, msmtp, neomutt) for reinstall reference.
Removes vdirsyncer/khal configs and calsync alias.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>