ci: tighten workflow foundation (#392) #1014

Job	Run time
examples/chat — python smoke	1m 28s
Cockpit — secret-gated integration	1m 27s
Cockpit — build / test	1m 44s
Library — lint / test / build	3m 32s
Cockpit — representative capability smoke	1m 21s
PostHog — dashboards-as-code drift check	1m 6s
Cockpit — deploy smoke dry-run	1m 26s
Website — e2e	2m 36s
Cockpit — build all examples	5m 27s
Website — lint / build	1m 48s
Cockpit — e2e	3m 24s
examples/chat — e2e	2m 17s
Canonical demo → Vercel	4m 17s
Deploy → Vercel	8m 6s
Production smoke	3m 44s
	43m 43s

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