feat(gtm): Spec 1C — cockpit instrumentation (analytics-foundation 1c) #916

Job	Run time
Cockpit — representative capability smoke	1m 31s
Cockpit — build all examples	5m 20s
Website — lint / build	1m 58s
Cockpit — build / test	1m 44s
Library — lint / test / build	3m 17s
Cockpit — secret-gated integration	1m 5s
PostHog — dashboards-as-code drift check	1m 20s
Cockpit — e2e	2m 16s
Website — e2e	2m 15s
examples/chat — aimock e2e	2m 41s
examples/chat — python smoke	1m 18s
Cockpit — deploy smoke dry-run	1m 3s
Deploy → Vercel	0s
Production smoke	-1s
	25m 47s

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