Drop redundant, broken trufflehog job from secret-scanner (#121) #116

Job	Run time
governance / Security policy checks	6s
governance / Guix primary / Nix fallback policy	8s
governance / Well-Known (RFC 9116 + RSR)	7s
governance / Trusted-base reduction policy	13s
governance / Language / package anti-pattern policy	10s
governance / Workflow security linter	6s
governance / Code quality + docs	17s
governance / Licence consistency	9s
governance / Validate Hypatia baseline	8s
	1m 24s

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