chore(licence): normalise to MPL-2.0 + CC-BY-SA-4.0 (canonical pair) #69

Job	Run time
governance / Language / package anti-pattern policy	43s
governance / Guix primary / Nix fallback policy	38s
governance / Licence consistency	35s
governance / Workflow security linter	38s
governance / Code quality + docs	41s
governance / Well-Known (RFC 9116 + RSR)	40s
governance / Check Workflow Staleness	8s
governance / Trusted-base reduction policy	40s
governance / Security policy checks	28s
governance / Validate Hypatia Baseline	0s
	5m 11s

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