fix(chat): GenUI streaming architecture — composition-level orchestration #676

Job	Run time
Website — lint / build	2m 3s
Cockpit — e2e	2m 6s
Cockpit — deploy smoke dry-run	1m 22s
Cockpit — secret-gated integration	1m 26s
Library — lint / test / build	3m 13s
Cockpit — build / test	2m 2s
examples/chat — python smoke	1m 29s
Cockpit — build all examples	5m 25s
Website — e2e	2m 21s
Cockpit — representative capability smoke	1m 39s
Deploy → Vercel	-1s
Production smoke	0s
	23m 5s

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