feat(examples-chat): Phase 3A — interrupts (HITL) (#222) #616

Job	Run time
Cockpit — representative capability smoke	1m 42s
Cockpit — build all examples	5m 16s
Website — lint / build	1m 54s
Cockpit — secret-gated integration	1m 29s
Library — lint / test / build	3m 3s
examples/chat — python smoke	1m 43s
Cockpit — build / test	1m 47s
Website — e2e	2m 14s
Cockpit — deploy smoke dry-run	1m 28s
Cockpit — e2e	2m 5s
Deploy → Vercel	1m 55s
Production smoke	2m 48s
	27m 24s

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