test(iopl): lock in KindNull enter and UNCLASSIFIED ret classification

Audit of iopl(2) (task wu). iopl(int level) changes the x86 I/O
privilege level of the calling thread and returns int 0/-1. The
existing coverage only asserted KindNull via a synthetic arg0 field
(TestClassifyE7NullNameOnlyKinds) and the FamilyMisc family tag (from
the prior ioperm audit, task uu). Add dedicated lock-in tests that use
the real 'int level' tracepoint field to prove it is never captured as
an fd or path, and that the sys_exit_iopl ret stays KindRet/UNCLASSIFIED
(a status code, not a transferred byte count). No implementation,
generated-artifact, or docs changes were needed - everything already
matched the man page.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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