Wire up email send.

Axis needs a Resend API key to dispatch mail. Vercel env var name: RESEND_API_KEY.

• resend.com/api-keys → — create a key named axis-vercel, copy the re_... value.
• Vercel → your project → Settings → Environment Variables → add RESEND_API_KEY, paste the value, check all three environment scopes.
• Wait for redeploy, then click Recheck above.

Optional but recommended: set the default from-address. Without it, Axis falls back to ATLY Studios <axis@atlystudios.com>.

• Vercel env vars → add AXIS_EMAIL_FROM with value ATLY Studios <axis@atlystudios.com> (or your preferred address).
• Optional: AXIS_EMAIL_REPLY_TO set to a real inbox you read (replies route there).

Resend rejects all sends until the from-address's domain has SPF / DKIM / DMARC records added. This is the most common cause of "Credential not found" / "domain not verified" errors.

• resend.com/domains → Add Domain → atlystudios.com (or your preferred sender domain).
• Copy the three DNS records Resend shows you (SPF, DKIM, DMARC) into your DNS provider.
• Wait 5–30 min for verification. Status flips to green in Resend's dashboard.
• This step has no live env check — only a real test-send below will reveal it.

Fires a real email through your live key. The response (success or exact Resend error) shows up below in plain English.