feat: cockpit dark mode token system #798

Job	Run time
Cockpit — representative capability smoke	1m 29s
examples/chat — python smoke	1m 44s
Cockpit — secret-gated integration	1m 40s
Library — lint / test / build	3m 33s
Cockpit — deploy smoke dry-run	1m 39s
Website — lint / build	1m 59s
Website — e2e	3m 7s
Cockpit — build / test	1m 47s
Cockpit — e2e	2m 58s
Cockpit — build all examples	5m 54s
Deploy → Vercel	-1s
Production smoke	-1s
	25m 48s

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