Wires the X-SES-CONFIGURATION-SET header on outbound auth emails so SES
bounce/delivery events flow through dev-ses-config to the dev-ses-events
SNS topic. Replaces the fire-and-forget "EMAIL MAGIC LINK SENT" log
(which fired before the SMTP transaction and swallowed downstream errors)
with structured EMAIL_MAGIC_LINK_SUCCESS/_FAILURE logs carrying the
Nodemailer messageId, so app-side sends are now correlatable with SES
events.
Motivated by the Atkins / Sustainable Building UK silent-quarantine
incidents where we couldn't tell whether SES had even tried to send.
Plan doc at docs/wip/auth-email-code-fallback-plan.md tracks the
broader email-code-fallback design that PR 2 will implement.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
