ci: gate fixture drift workflow on manual dispatch only #831

Job	Run time
Library — lint / test / build	3m 14s
Cockpit — secret-gated integration	1m 2s
Cockpit — representative capability smoke	1m 19s
Cockpit — build / test	1m 39s
Cockpit — build all examples	5m 11s
Cockpit — e2e	1m 48s
examples/chat — aimock e2e	1m 59s
Website — lint / build	1m 42s
examples/chat — python smoke	1m 25s
Cockpit — deploy smoke dry-run	1m 4s
PostHog — dashboards-as-code drift check	1m 16s
Website — e2e	2m 17s
Deploy → Vercel	0s
Production smoke	0s
	23m 56s

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