chore(gitignore): match nested target/ for all crates, not just the repo root #240

Job	Run time
governance / Well-Known (RFC 9116 + RSR)	6s
governance / Security policy checks	7s
governance / Code quality + docs	10s
governance / Language / package anti-pattern policy	8s
governance / Workflow security linter	4s
governance / Guix primary / Nix fallback policy	5s
	40s

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