There is one Tomcat installed. And it points to the correct path.

I'm attaching the output text of:

cc-clean-build
clean
build

which I executed in that order.

I do see these kinds of messages:

 Copying 4 files to C:\labkey23\build\modules\experiment\pageflowTempDir

but not the others you suggested. No _pageflow subdirectories are created.

As for which classes get compiled, I'm attaching the output of running the DOS tree command on the \build\core\modules directory.