Refresh chat install and markdown docs #2018

Job	Run time
CI scope	2m 11s
Website — lint / build	2m 42s
Website — e2e	2m 48s
examples/ag-ui — e2e	3m 34s
Cockpit — representative capability smoke	-1s
Cockpit — build all examples	-1s
Library — lint / test / build	-1s
Cockpit — secret-gated integration	-1s
examples/chat — python smoke	-1s
Cockpit — build / test	-1s
examples/chat — e2e	0s
PostHog — dashboards-as-code drift check	-1s
examples/chat — e2e (${{ matrix.shard }}/4)	-1s
Cockpit — e2e dispatcher	-1s
Canonical demo → Vercel	0s
Cockpit — deploy smoke dry-run	-1s
Cockpit — e2e (${{ matrix.cap.angular }})	0s
Cockpit — e2e	0s
CI — required	2s
Deploy → Vercel	-1s
Production smoke	-1s
ag-ui demo → Vercel	-1s
	11m 4s

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