test(generate): lock in wait4 KindProc/Process audit

Audit of wait4(2): pid_t wait4(pid_t pid, int *wstatus, int options,
struct rusage *rusage) waits for a child process to change state and
optionally retrieves its resource usage. None of the arguments is an fd
or a filesystem path: args[0] (pid) is a process/group selector -- a pid,
NOT a file descriptor; args[1] (wstatus) and args[3] (rusage) are
userspace output pointers; args[2] (options) is an int flag set. The
return value is a pid_t (child pid, 0 for WNOHANG, or -1) -- never a byte
count. The existing classification (KindProc -> null_event, FamilyProcess,
ret UNCLASSIFIED) and the generated null_event enter handler (captures no
args) are correct, matching siblings waitid/clone/fork/vfork, and
docs/syscall-tracing-plan.md plus the drift tests are in sync.

Add a dedicated lock-in test, modeled on the clone3 audit, that asserts
the wait* siblings classify as KindProc, the family is Process, the
generated enter handler emits a null_event capturing none of the args
(so the pid at args[0] is never misclassified as an fd), and the
pid/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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