test(generate): lock in times(2) syscall classification

Audit of times(2) (clock_t times(struct tms *buf)) confirmed its
classification is correct and consistent with its time/clock siblings:

- sys_enter_times: KindNull (single userspace output struct tms *buf;
  no fd or pathname argument).
- sys_exit_times: ret_event UNCLASSIFIED — times() returns a clock_t
  tick count (or (clock_t)-1 on error), which is a tick tally, not a
  transferred byte count.
- family: FamilyTime, alongside gettimeofday/clock_gettime, and NOT
  FamilyProcess where getrusage lives.

No misclassification was found; docs/syscall-tracing-plan.md already
lists times under the Time family and the null kind. Add lock-in tests
so any stray reclassification trips a unit test:

- family_test.go: assert sys_enter/exit_times == FamilyTime.
- retclassify_test.go: assert sys_exit_times stays UNCLASSIFIED.

KindNull is already covered by TestClassifyM7NameOnlyKinds.

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

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