the Resend API key (the app pulls it from @suluk/env).
default From, e.g. "Acme noreply@acme.com" — must be a verified Resend domain.
Optionalfetchinject a fetch (default: global fetch) — for testing / a custom transport.
Optionalinit: RequestInitOptionalcostadvisory per-send cost in µ$ for @suluk/cost metering.
@suluk/email— the missing EmailProvider binding + a per-event/per-locale branded template set. The app RENDERS a message (pure, branded, localized via @suluk/i18n) and SENDS it through a swappable provider (consoleProvider in dev; a Workers-safe resendProvider in prod). Never a hosted mailer — the provider is a thin binding (the@suluk/builderemailslot impl). CANDIDATE tooling.