chore(workflow): upgrade npm CLI for trusted publishing OIDC support #455

Job	Run time
Cockpit — deploy smoke dry-run	1m 6s
Cockpit — e2e	1m 57s
Cockpit — build all examples	4m 49s
Library — lint / test / build	1m 26s
Website — lint / build	1m 48s
Cockpit — secret-gated integration	1m 5s
Chat Agent — smoke	1m 12s
Cockpit — build / test	1m 40s
Cockpit — representative capability smoke	1m 17s
Website — e2e	2m 5s
Deploy → Vercel	0s
Production smoke	0s
	18m 25s

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