ci(codeql): cron weekly→monthly (cut 3, standards#233 Option B) (#41) #32

Job	Run time
governance / Guix primary / Nix fallback policy	6s
governance / Well-Known (RFC 9116 + RSR)	4s
governance / Trusted-base reduction policy	9s
governance / Validate Hypatia baseline	5s
governance / Language / package anti-pattern policy	8s
governance / Workflow security linter	5s
governance / Licence consistency	7s
governance / Code quality + docs	17s
governance / Security policy checks	5s
	1m 6s

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