feat(examples-chat): canonical @ngaf/chat demo + smoke generator (Pha… #599

Job	Run time
Cockpit — secret-gated integration	1m 21s
Cockpit — build / test	1m 43s
Website — lint / build	1m 59s
Cockpit — representative capability smoke	1m 25s
Library — lint / test / build	3m 7s
examples/chat — python smoke	1m 25s
Cockpit — deploy smoke dry-run	1m 16s
Cockpit — e2e	2m 0s
Website — e2e	2m 39s
Cockpit — build all examples	4m 53s
Deploy → Vercel	6m 51s
Production smoke	2m 55s
	31m 34s

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