fix(ci): add missing SPDX headers to workflow files (#163) #286

Job	Run time
governance / Code quality + docs	9s
governance / Check Workflow Staleness	7s
governance / Well-Known (RFC 9116 + RSR)	4s
governance / Guix primary / Nix fallback policy	6s
governance / Language / package anti-pattern policy	8s
governance / Workflow security linter	3s
governance / Trusted-base reduction policy	8s
governance / Licence consistency	8s
governance / Security policy checks	5s
governance / Validate Hypatia Baseline	0s
	58s

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