feat(a2ui): v0.9 action envelope and sendDataModel transport #327

Job	Run time
Cockpit — e2e	1m 47s
Website — e2e	2m 14s
Cockpit — deploy smoke dry-run	1m 5s
Cockpit — secret-gated integration	1m 4s
Cockpit — build / test	1m 29s
Website — lint / build	1m 39s
Chat Agent — smoke	1m 23s
Cockpit — build all examples	4m 53s
Cockpit — representative capability smoke	1m 9s
Library — lint / test / build	1m 18s
Deploy → Vercel	0s
Production smoke	0s
	18m 1s

Provide feedback