test(sysinfo): lock in KindNull + FamilyMisc + UNCLASSIFIED ret

Audit of sysinfo(2): int sysinfo(struct sysinfo *info) returns overall
system statistics into a single userspace output pointer (not an fd or
path) and returns 0/-1. The existing classification was already correct
(KindNull, FamilyMisc, UNCLASSIFIED return) and docs/generated artifacts
are consistent; no behavior change was needed.

Add dedicated lock-in regression tests mirroring the rt_sigpending audit:
- TestGenerateSysinfoHandler: enter emits a null_event and captures no
  args; exit emits a ret_event with ctx->ret tagged UNCLASSIFIED.
- TestClassifyRetSysinfoUnclassified: the 0/-1 status is never a byte
  count.
- family_test.go: assert sysinfo/newuname/sysfs stay in FamilyMisc, with
  a note that ustat is FamilyFS (matched by the 'stat' name marker) and
  is intentionally not grouped here.

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

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