test(generate): lock in get_robust_list/set_robust_list classification

Audit of get_robust_list(2)/set_robust_list(2) found the existing
classification already correct and consistent across classify.go,
family.go, the generated C handlers, and docs/syscall-tracing-plan.md:

  - enter is KindNull: args[0] of get_robust_list is a PID, not an fd,
    and head_ptr/len_ptr are userspace output pointers (no fd/path), so
    the pid must not be picked up as a file descriptor.
  - exit is ret_event UNCLASSIFIED: both return 0/-1 with no byte count.
  - family is Misc, grouped with the per-thread sibling rseq rather than
    promoted to IPC like the futex_* shared-memory primitives.

Add TestClassifyGetRobustListPidNotFd pinning these invariants (Kind,
Family, Ret) plus a futex_* IPC contrast case, mirroring the prior
sched_getattr/recvmsg audit lock-in tests. No behavior change.

The IPC-vs-Misc family question for the robust-list pair is tracked as
a separate follow-up task, not changed here (no clear correctness case).

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

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