AK3+Backend: remove all backwards compat (it's been years)

META-INF/com/google/android/update-binary

@@ -563,9 +563,6 @@ do_levelcheck;
 do_vendorlevelcheck;
 
 ui_print "Installing...";
-# hack to maintain support for anykernel.sh files that weren't updated correctly along with the AK core
-CORE=$(grep -oE 'ak.*core.sh' anykernel.sh);
-[ -f tools/$CORE ] || ln -s $AKHOME/tools/ak*-core.sh $AKHOME/tools/$CORE;
 ash anykernel.sh;
 if [ $? != 0 ]; then
   abort;

META-INF/com/google/android/updater-script

@@ -3,4 +3,4 @@
 # Dummy file; update-binary is a shell script (DO NOT CHANGE)
 #
 #
-# AK_BASE_VERSION=20260225
+# AK_BASE_VERSION=20260628