docs(readme): flip stale PMPL-1.0 license badge to MPL-2.0 #42

Job	Run time
governance / Validate Hypatia baseline	4s
governance / Well-Known (RFC 9116 + RSR)	5s
governance / Code quality + docs	14s
governance / Language / package anti-pattern policy	9s
governance / Licence consistency	7s
governance / Security policy checks	7s
governance / Guix primary / Nix fallback policy	5s
governance / Trusted-base reduction policy	7s
governance / Workflow security linter	6s
	1m 4s

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