feat(chat): decouple primitives from LangGraph via runtime-neutral Ch… #409

Job	Run time
Website — e2e	2m 43s
Cockpit — representative capability smoke	1m 37s
Chat Agent — smoke	1m 36s
Library — lint / test / build	1m 50s
Cockpit — deploy smoke dry-run	1m 14s
Cockpit — build all examples	5m 12s
Website — lint / build	2m 8s
Cockpit — build / test	1m 56s
Cockpit — secret-gated integration	1m 26s
Cockpit — e2e	2m 16s
Deploy → Vercel	7m 55s
Production smoke	2m 5s
	31m 58s

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