fix: harness-agnostic repo_full fallback in backup verifier libs #25

Job	Run time
contract-audit	1m 28s
smoke-runtime (baseline, configs/registry_smoke_matrix.json)	21m 8s
smoke-runtime (sg-only, configs/registry_smoke_matrix.json)	5m 25s
smoke-runtime (artifact-only, configs/registry_smoke_artifact_matrix.json)	12m 18s
	40m 19s

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