ci: skip dependency setup for irrelevant checks #1016

Job	Run time
Website — lint / build	2m 3s
Cockpit — build all examples	5m 19s
Cockpit — secret-gated integration	2s
Cockpit — representative capability smoke	1m 29s
Cockpit — build / test	1m 43s
PostHog — dashboards-as-code drift check	1m 28s
examples/chat — e2e	2m 20s
Website — e2e	2m 22s
examples/chat — python smoke	1m 22s
Cockpit — e2e	2m 59s
Cockpit — deploy smoke dry-run	1m 16s
Library — lint / test / build	3m 11s
Canonical demo → Vercel	0s
Deploy → Vercel	0s
Production smoke	0s
	25m 34s

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