Non-blocking items from the v76 reviewer pass. No redeploy needed — the box runs
v76 and its happy path is unaffected; these ride the next build:
- digest_mailer.send_digest: when Gmail is enabled but no sender resolves
(CRM_DIGEST_SENDER unset and no admin email), raise NoTransport so the caller
returns a clear 400 instead of a generic 502.
- gmail_send.send_via_gmail: wrap OSError/URLError (timeout/DNS) as a RuntimeError
("Gmail API unreachable: ...") to match the HTTPError handling; include the
sender in the HTTPError message for debuggability.
- credentials.py: correct the now-stale GMAIL_COMPOSE_SCOPE comment (the digest
mailer sends with this scope; only outreach drafts never send).
- test_gmail_send.py: add the HTTPError->RuntimeError branch, default_sender DB
fallback (+None case + env override), and the send_digest SMTP-tag path.
19/19 backend tests green.
Keysat
fee037a630