feat(website): update render & chat landing pages with A2UI specifics #322

Job	Run time
Cockpit — representative capability smoke	1m 12s
Website — lint / build	1m 48s
Cockpit — build all examples	4m 26s
Chat Agent — smoke	1m 15s
Cockpit — e2e	2m 3s
Cockpit — deploy smoke dry-run	1m 14s
Library — lint / test / build	1m 28s
Cockpit — secret-gated integration	1m 4s
Website — e2e	2m 7s
Cockpit — build / test	1m 38s
Deploy → Vercel	0s
Production smoke	0s
	18m 15s

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