feat(website): wire whitepaper signup to Resend email pipeline + drip sequences #320

Job	Run time
Cockpit — build / test	1m 38s
Library — lint / test / build	1m 16s
Chat Agent — smoke	1m 21s
Cockpit — deploy smoke dry-run	1m 12s
Website — e2e	2m 18s
Cockpit — e2e	1m 43s
Website — lint / build	1m 51s
Cockpit — secret-gated integration	1m 13s
Cockpit — build all examples	4m 54s
Cockpit — representative capability smoke	1m 15s
Production smoke	0s
Deploy → Vercel	0s
	18m 41s

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