refactor(tw): extract Tw_section.Encode.ownership; delete orphan tw_ownership_section.ml #576

Job	Run time
governance / Well-Known (RFC 9116 + RSR)	5s
governance / Language / package anti-pattern policy	9s
governance / Guix primary / Nix fallback policy	5s
governance / Workflow security linter	5s
governance / Code quality + docs	14s
governance / Validate Hypatia baseline	6s
governance / Security policy checks	6s
governance / Trusted-base reduction policy	6s
governance / Licence consistency	5s
	1m 1s

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