fix: batch harness-hardening (P1-P2 issues from verifier audit) #24

Job	Run time
smoke-runtime (artifact-only, configs/registry_smoke_artifact_matrix.json)	11m 24s
smoke-runtime (sg-only, configs/registry_smoke_matrix.json)	5m 12s
contract-audit	1m 28s
smoke-runtime (baseline, configs/registry_smoke_matrix.json)	21m 25s
	39m 29s

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