test(generate): lock in getpeername exit classification as KindRet

Audit of the getpeername(2) syscall confirmed the tracing pipeline already
matches the man page: FamilyNetwork + KindFd (sockfd at args[0]) on enter, and
a plain ret_event (int 0/-1) on exit. The enter classification was already
covered by TestClassifySocketFdSyscallsByName, but the exit path (resolved via
the generic 'ret' field matcher) had no dedicated assertion. Add
TestClassifyExitGetpeername to pin sys_exit_getpeername -> KindRet so future
classifier changes cannot silently regress it.

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

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