test(generate): lock in rseq family and return classification

Audit of the rseq(2) syscall confirmed the existing classification is
correct and consistent with its siblings:

- KindNull: the rseq argument is a userspace struct pointer (not an fd or
  filesystem path), and args[2] flags are intentionally not captured, in
  line with the KindNull convention shared with set_robust_list and
  membarrier. (Already covered by classify_test.go.)
- FamilyMisc: rseq is not in the explicit family table and falls through
  to Misc, grouped with its closest per-thread sibling
  set_robust_list/get_robust_list (also Misc).
- Return value is int 0/-1 with no byte count, so its exit stays
  UNCLASSIFIED.

Add lock-in tests for the family and return-value classification (kind
was already covered) so a future drift in either is caught.

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

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