# iteration history (full honesty):
# v1: failed -Werror=nested-externs (so_pru_send decl) -> added <sys/socketops.h>
# v2: built OK but rig had malformed chain (pkthdr m_len=MLEN > MHLEN room)
#     -> attempt-1 run panicked in m_free KASSERT (see rig_attempt1_panic.txt)
# v3 (FINAL): m_len=MHLEN everywhere; builds clean, runs correct.