chore(ci): add dormant push-email notification workflow #66

Job	Run time
governance / Workflow security linter	37s
governance / Well-Known (RFC 9116 + RSR)	31s
governance / Guix primary / Nix fallback policy	30s
governance / Licence consistency	32s
governance / Language / package anti-pattern policy	28s
governance / Code quality + docs	34s
governance / Trusted-base reduction policy	32s
governance / Check Workflow Staleness	7s
governance / Security policy checks	30s
governance / Validate Hypatia Baseline	0s
	4m 21s

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