chore(license): replace 14 subdir LICENSEs + flip 446 SPDX stamps (Phase 4) #95

Job	Run time
governance / Licence consistency	43s
governance / Security policy checks	39s
governance / Language / package anti-pattern policy	12s
governance / Validate Hypatia baseline	9s
governance / Code quality + docs	24s
governance / Well-Known (RFC 9116 + RSR)	32s
governance / Workflow security linter	32s
governance / Trusted-base reduction policy	11s
governance / Guix primary / Nix fallback policy	27s
	3m 49s

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