Fix Illegal invocation in moderation emails

[admdly]

Summary

Both email senders defaulted to a bare globalThis.fetch reference, which throws Illegal invocation on Cloudflare Workers (fetch requires its this receiver). This broke all moderation notifications regardless of provider, surfacing as notified: false (e.g. developer-approved). Adds a bound defaultFetch wrapper in email/types.ts and uses it as the default in MxrouteSender and ResendSender.

Adds a regression test that stubs globalThis.fetch with Workers-like this enforcement and covers both senders plus the createEmailSender(env) factory path used by notify.ts.

[cubic-dev-ai]

No issues found across 4 files

<sub>Auto-approved: Fixes Cloudflare Workers fetch binding for both moderation email providers and the factory path. The focused regression test verifies the corrected behavior without changing rollout, contracts, or operational policy.

Re-trigger cubic</sub>

[cloudflare-workers-and-pages]

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	api	18a42a8	Commit Preview URL Branch Preview URL	Sep 17 2026, 02:07 PM