* fix(sandbox): handle OpenSandbox PVC lifecycle races and UID preconditions (#7423) * fix(sandbox): handle OpenSandbox PVC lifecycle races and UID preconditions * refactor(sandbox): operate volume manager on explicit claimName * refactor(sandbox): configure OpenSandbox image and compact volume names refactor(sandbox): unify volume schemas and volume-manager contracts fix(sandbox): harden OpenSandbox volume lifecycle * fix(sandbox): handle stale restore rollback phases and legacy volume fallback
