test(generate): lock in bind syscall classification

Audit of bind(2): int bind(int sockfd, const struct sockaddr *addr,
socklen_t addrlen). Verified the existing classification is correct and
consistent with its socket-setup siblings connect/listen/accept/
getsockname/getpeername:

- KindFd, capturing ev->fd = args[0] (the sockfd); the addr pointer and
  addrlen are not captured.
- FamilyNetwork.
- Exit is UNCLASSIFIED (returns 0/-1, no transferred byte count).

No implementation or doc changes were needed (docs/syscall-tracing-plan.md
already lists bind under Network and fd; drift test green). Added
regression coverage:

- FormatBind/FormatExitBind fixtures mirroring the real kernel tracepoint.
- TestGenerateBindHandler with negative guards (no probe_read on the
  sockaddr, no fd capture from args[1]/args[2], exit stays UNCLASSIFIED).
- bind + connect/listen/getsockname/getpeername added to the
  family (FamilyNetwork) and ret-classification (UNCLASSIFIED) lock-in
  lists.

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

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