Fix ABI contract: align result codes, add linear handle tracking #102

Job	Run time
governance / Well-Known (RFC 9116 + RSR)	7s
governance / Language / package anti-pattern policy	10s
governance / Security policy checks	8s
governance / Licence consistency	7s
governance / Code quality + docs	15s
governance / Check Workflow Staleness	6s
governance / Trusted-base reduction policy	8s
governance / Guix primary / Nix fallback policy	4s
governance / Workflow security linter	7s
governance / Validate Hypatia Baseline	0s
	1m 12s

Provide feedback