Add private access declarations and task-scoped boundaries for sysfs,
copy-manager admission, grace periods and blocking waits. Preserve
their original operations outside the current test task.
Share the existing ACG release-work layout through the private core
header so the worker and its separate test object use one definition.
Link separate lifecycle and blocker suites covering rollback, mapping
detach order, ACG worker locking and reference ownership. Cleanup
tolerates failed initialization and assertions.
Gleb Chesnokov
e284f3299a