docs(chat): adapter authoring guide #465

Job	Run time
Website — lint / build	1m 41s
Cockpit — build / test	1m 34s
Cockpit — deploy smoke dry-run	1m 16s
Library — lint / test / build	2m 6s
Cockpit — build all examples	4m 46s
Cockpit — secret-gated integration	1m 5s
Cockpit — representative capability smoke	1m 2s
Cockpit — e2e	1m 55s
Website — e2e	2m 10s
Chat Agent — smoke	1m 14s
Deploy → Vercel	0s
Production smoke	0s
	18m 49s

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