Shen S42 JVM port - Java 21/25 compatible build

This distribution has one canonical Shen kernel source tree:

  KLambda\

There is no second maintained copy inside the Java source tree. During
installation, install.bat copies KLambda into the installed Shen directory,
rebuilds the Java runtime/compiler, then KLCompiler compiles that KLambda
tree into JVM classes under classes\shen.

To update Shen:
  1. replace KLambda\ with the new KLambda tree
  2. run install.bat again

This build uses the official OW2 ASM 9.10.1 libraries rather than
JDK-internal ASM packages. install.bat downloads those five small JARs
from Maven Central.

Install:
  double-click install.bat

Then open a new Command Window and run:
  shen-jvm

Test Programs are included in the installation.
