feat(brand): polish @ngaf/langgraph + @ngaf/ag-ui READMEs; add cockpi… #791

Job	Run time
Library — lint / test / build	3m 32s
Cockpit — secret-gated integration	1m 23s
Cockpit — build all examples	5m 23s
examples/chat — python smoke	1m 33s
Cockpit — e2e	9m 58s
Cockpit — representative capability smoke	1m 46s
Cockpit — build / test	1m 53s
Website — lint / build	1m 46s
Cockpit — deploy smoke dry-run	1m 28s
Website — e2e	2m 47s
Deploy → Vercel	9m 59s
Production smoke	6m 31s
	47m 59s

Provide feedback