Audit-hook bypass via unchecked sourceless bytecode import

Audit-hook bypass in CPython before 3.13.13, 3.14.0 through 3.14.3, and 3.15.0a1 through 3.15.0a6 allows local users to load unvalidated bytecode. FileLoader.get_data omits SourcelessFileLoader from the classes read with io.open_code(), falling back to FileIO and suppressing the expected audit event. Exploitation requires a source-less .pyc earlier on the import path and an environment that relies on io.open_code validation; the default source-first path is unaffected.