Read and send mail for an ACG mailbox via the shared Claude-MSP-Access Graph app
(fabb3421), defaulting to the running user's mailbox from identity.json (mike/howard).
Send and reply are hard-gated: full To/Cc/Subject/Body preview + explicit confirm,
external recipients flagged, no retries/bulk, saved to Sent. Read path verified live;
token cached to .claude/tmp (gitignored), secret from SOPS vault.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
