fix(chat): revert a2ui assistant ID to c-a2ui to match deployment (#118) #366

Job	Run time
Cockpit — deploy smoke dry-run	1m 10s
Website — lint / build	1m 37s
Library — lint / test / build	1m 17s
Cockpit — build all examples	4m 58s
Cockpit — build / test	1m 29s
Chat Agent — smoke	1m 14s
Cockpit — e2e	1m 50s
Cockpit — secret-gated integration	1m 8s
Cockpit — representative capability smoke	1m 12s
Website — e2e	2m 6s
Deploy → Vercel	1m 38s
Production smoke	2m 34s
	22m 13s

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