feat(cockpit): aimock harness library + per-example e2e (Phase 2) #934

Job	Run time
Cockpit — representative capability smoke	1m 37s
Website — lint / build	2m 0s
Cockpit — build / test	1m 57s
Library — lint / test / build	3m 46s
Cockpit — secret-gated integration	1m 18s
Cockpit — build all examples	5m 59s
Cockpit — deploy smoke dry-run	1m 28s
Website — e2e	2m 15s
examples/chat — aimock e2e	2m 49s
PostHog — dashboards-as-code drift check	1m 35s
Cockpit — e2e	2m 39s
examples/chat — python smoke	1m 42s
Deploy → Vercel	0s
Production smoke	0s
	29m 5s

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