test(generate): lock in clone3 KindProc/Process/UNCLASSIFIED classification

Audit of clone3(2): long clone3(struct clone_args *cl_args, size_t size).
Neither arg is an fd or filesystem path (cl_args is a userspace control
block, size is its byte length), and the return value is a pid_t (child
PID in the parent, 0 in the child, -1 on error) — not a byte count.

clone3 was already correctly classified as KindProc in FamilyProcess with
an UNCLASSIFIED exit, identical to its clone/fork/vfork siblings; the
generated BPF handlers emit a null_event on enter (no arg capture) and a
ret_event tagged UNCLASSIFIED on exit. No code, classification, or doc
changes were needed.

Add TestGenerateClone3Handler to pin this down against future drift:
the name-only table maps all four siblings to KindProc even when fed the
real (struct clone_args *, size_t) args, the family is Process, the ret
is UNCLASSIFIED, the enter handler captures no ctx->args[], and the exit
handler reports ret_type=UNCLASSIFIED.

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

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