feat(deploy): add canonical demo chat graph to shared cockpit-dev deployment (Phase 1) #805

Job	Run time
Cockpit — build all examples	4m 58s
Cockpit — representative capability smoke	1m 8s
Cockpit — build / test	1m 33s
Website — lint / build	1m 58s
Library — lint / test / build	3m 13s
Cockpit — deploy smoke dry-run	1m 12s
Cockpit — secret-gated integration	1m 16s
Cockpit — e2e	2m 9s
examples/chat — python smoke	1m 27s
Website — e2e	2m 28s
Deploy → Vercel	0s
Production smoke	0s
	21m 22s

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