Export real buff and cancellation packets from isolated server casts
Add optional research instrumentation that executes actual buff casts through SpecialMoveHandler/MapleStatEffect in the existing isolated non-GM server fixtures, validates HP/MP and stored per-stat values, and exports actual local GIVE_BUFF/CANCEL_BUFF bytes. No production skill logic changes.
With NATIVE_BUFF_EXPORT=true, the disposable suite exports 61 cast/cancel pairs: every ordinary/hidden Speed Infusion rank, low/high ranks of all 14 Explorer boosters, and Rage/Focus/Bless/Hyper Body controls. The full running-server suite passed 11,380 assertions. The paired native research probe reproduces 46 reception/effect failures; server acceptance is not claimed as client functionality.
Related #42 and client #1, neither closed. Depends on !88. Export is optional and defaults off; CI/deployment behavior and authored gameplay rules are unchanged. No merge or campaign mutation.