test(generate): lock in io_uring_register classification audit

Audit of io_uring_register(2) confirmed the existing tracing is correct:
KindFd with the io_uring fd captured at args[0], FamilyAIO (matching
io_uring_setup/io_uring_enter), and an UNCLASSIFIED ret_event exit. The
sys_enter_io_ KindNull prefix rule does NOT mis-catch it because
classifyNameOnly consults the exact nameOnlyKindsTable (KindFd) before the
prefix list.

Add two lock-in tests to guard these invariants:
- TestIoUringRegisterTablePrecedenceOverIoPrefix: the explicit KindFd table
  entry wins over the sys_enter_io_ KindNull prefix rule (with an io_submit
  sanity check that the prefix rule still yields KindNull for fd-less AIO
  siblings).
- TestIoUringRegisterReturnUnclassified: the exit returns 0/small-positive,
  never a byte count, so the io_uring group stays out of retClassifications.

No code, docs, or generated artifacts changed; mage generate produces no diff.

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

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