fix(c-generative-ui): emit_state → get_stream_writer (LangGraph 1.x) #939

Job	Run time
Cockpit — deploy smoke dry-run	1m 19s
PostHog — dashboards-as-code drift check	1m 35s
Library — lint / test / build	3m 44s
Cockpit — e2e	2m 37s
Website — e2e	2m 41s
Cockpit — build all examples	5m 47s
examples/chat — aimock e2e	2m 55s
Cockpit — secret-gated integration	1m 24s
Cockpit — representative capability smoke	1m 30s
Cockpit — build / test	1m 50s
examples/chat — python smoke	1m 38s
Website — lint / build	1m 57s
Production smoke	0s
Deploy → Vercel	0s
	28m 57s

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