The packer wipes and rebuilds dist\, which silently discarded the
hand-made steam_appid.txt every repack - and without it SteamAPI_Init
fails and the game quietly falls back to TCP, which is the confusing
symptom testers hit. The dist now ships it (480, Spacewar) alongside
the RP412STEAM=1 environ.ini, so copying the folder to a machine with
Steam running is the whole setup. Test doc updated to match.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>