chore(ci): add dormant push-email notification workflow #72

Job	Run time
governance / Check Workflow Staleness	6s
governance / Well-Known (RFC 9116 + RSR)	31s
governance / Guix primary / Nix fallback policy	33s
governance / Language / package anti-pattern policy	36s
governance / Code quality + docs	40s
governance / Workflow security linter	41s
governance / Licence consistency	33s
governance / Trusted-base reduction policy	35s
governance / Security policy checks	41s
governance / Validate Hypatia Baseline	-1s
	4m 55s

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