fix: P2 harness-agnostic fixes (instruction claims, workspace perms, … #22

Job	Run time
smoke-runtime (baseline, configs/registry_smoke_matrix.json)	21m 49s
contract-audit	1m 31s
smoke-runtime (sg-only, configs/registry_smoke_matrix.json)	12m 55s
smoke-runtime (artifact-only, configs/registry_smoke_artifact_matrix.json)	12m 24s
	48m 39s

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