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chore(ci): make Scorecard periodic, not per-push #212

Job	Run time
governance / Trusted-base reduction policy	7s
governance / Language / package anti-pattern policy	13s
governance / Licence consistency	8s
governance / Well-Known (RFC 9116 + RSR)	5s
governance / Check Workflow Staleness	7s
governance / Workflow security linter	4s
governance / Guix primary / Nix fallback policy	7s
governance / Security policy checks	7s
governance / Code quality + docs	6s
governance / Validate Hypatia Baseline	-1s
	1m 3s