CVS is installed with Xcode as far as I can tell; Its in the iPhone SDK download (open the iPhone SDK.pkg up in Pacifist and look under DeveloperToolsCLI.pkg/usr/bin/).
Though I'm surprised OS X ships with SVN by default. FWIW, the version of SVN that ships is 1.4.4 (and it still hasn't been updated as of 10.5.6 or iPhone SDK for 2.2.1.
And Python.framework and Ruby.framework are installed to let you run other programs people write. Same reason you have Java, Tcl/Tk and all the ObjC/Cocoa frameworks. Having the frameworks != writing code.
Though I'm surprised OS X ships with SVN by default. FWIW, the version of SVN that ships is 1.4.4 (and it still hasn't been updated as of 10.5.6 or iPhone SDK for 2.2.1.
And Python.framework and Ruby.framework are installed to let you run other programs people write. Same reason you have Java, Tcl/Tk and all the ObjC/Cocoa frameworks. Having the frameworks != writing code.