test(perf_event_open): lock in audit findings

Audited perf_event_open(2) against the man page: it returns a new fd (or
-1), args[0] is a struct perf_event_attr* userspace pointer (NOT an fd),
args[1] is a monitored pid, and only args[3] group_fd is a real fd.

The existing implementation is correct (KindPerfOpen by name, not KindFd;
FamilySecurity; exit as UNCLASSIFIED RetEvent). Add lock-in tests:
- codegen: assert args[0] is read via bpf_probe_read_user as the attr
  struct and never captured as an fd (negative assertions on args[0]/args[1]).
- eventloop: a failed return (-1) registers no fd in fdState.
- perfDescriptorName format pin (perf: prefix).

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

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