Anti-cheat off, weapon sets 6-7 in hero files

- The game's cheater detection killed the hero ("Hase!") whenever its
  protected stat mirror was stale; the mirror is now refreshed from the hero
  whenever it is unlocked, stream checks never punish, loadHero no longer
  sets the cheater flag (docs/anticheat.md).
- saveHero wrote the items of weapon sets 1-5 only: its loop runs over all 7
  sets, so sets 6-7 survive a world loading the hero from the hero file.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

CMakeLists.txt

@@ -74,6 +74,7 @@ add_library(sacredK SHARED
     src/mods/screen.cpp
     src/mods/characters.cpp
     src/mods/mainmenu.cpp
+    src/mods/anticheat.cpp
 )
 target_include_directories(sacredK PRIVATE src)
 target_compile_options(sacredK PRIVATE ${SACREDK_CXX_FLAGS})