test(generate): lock in rt_tgsigqueueinfo KindNull/Signals audit

Audit of rt_tgsigqueueinfo(2): int rt_tgsigqueueinfo(pid_t tgid, pid_t
tid, int sig, siginfo_t *info) queues a signal plus data to a thread in
a thread group. Args are pids (tgid/tid), a signal number, and a
userspace siginfo_t pointer -- no fds or filesystem paths. The existing
classification (KindNull, FamilySignals, ret UNCLASSIFIED) and the
generated null_event enter handler (captures no args) are correct, and
docs/syscall-tracing-plan.md plus the drift tests are in sync.

Add dedicated lock-in tests, modeled on the rt_sigpending audit, that
assert the generated handler emits a null_event capturing none of the
args (so tgid/tid are never misclassified as fds) and that the int
0/-1 return stays UNCLASSIFIED rather than a byte-count transfer.

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

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