test(setsockopt): lock in KindFd enter, UNCLASSIFIED exit, Network family

Audit of setsockopt(2) found the tracing implementation already correct:
sockfd captured at ctx->args[0] (KindFd), exit ret_event UNCLASSIFIED, and
FamilyNetwork — matching the man page and the bind/connect/getsockname/
getpeername/getsockopt siblings, with generated C/Go and docs all consistent.

Add lock-in tests mirroring prior per-syscall audits:
- TestClassifySetsockoptEnterFd: enter is KindFd with no pathname capture,
  asserted against the real sockfd/level/optname/optval/optlen fields.
- TestClassifyExitSetsockoptUnclassifiedRet: exit is KindRet + UNCLASSIFIED
  (0/-1 status, not a byte count).
- TestClassifyExitGetsockoptUnclassifiedRet: same for the read-side sibling.
- TestClassifySyscallFamily: pin setsockopt (enter+exit) and getsockopt to
  FamilyNetwork.

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

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