Guild Chest Fix 1.2.0

Hardening release after a full review of every code path. The running game check now also catches a dedicated server running on the same PC, which could otherwise overwrite your edit on shutdown. A save using a future container variant now gets a clear message instead of a confusing error. If a future game update changes how guild or container data is stored, the tool now says plainly that it needs an update instead of failing with a cryptic error. One unreadable guild entry no longer stops the whole scan, it is skipped with a note. Failed runs can no longer leave a temporary file next to your save. As always, every edit is verified byte by byte, checked by reading the written file back, and a backup of the untouched save is kept.