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Phase 4: CREATE Handler dynamic oplock granting - Use OplockManager.can_grant() to determine oplock level - Register OplockEntry if oplock granted - Support ShareAccess compatibility checking - Grant Level II if exclusive/batch oplock exists Phase 6: CLOSE Handler oplock cleanup - Unregister from OplockManager when file closed - Only unregister if oplock_level > 0 All 229 tests pass.