test(generate): lock in gettimeofday classification

Audit of gettimeofday(2) confirmed the existing implementation is
correct: it is classified KindNull (userspace timeval/timezone pointer
args, not fd/path) and FamilyTime alongside its clock_gettime/
settimeofday/time siblings; its exit emits a plain ret_event carrying
the int 0/-1 return as UNCLASSIFIED. mage generate produces no diff.

Add lock-in tests mirroring prior syscall audits:
- family_test.go asserts sys_enter/exit_gettimeofday => FamilyTime
- retclassify_test.go asserts gettimeofday exit stays UNCLASSIFIED

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

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