Two CI fixes. The builder image lacked nodejs, so every job died at the first step with "exec: node: executable file not found in $PATH" (exit 127). actions/checkout and actions/cache are JavaScript actions: the runner execs node inside the job container to run them, so the image needs it even though the build itself does not. Verified by exec'ing node with no shell, which is how the runner invokes it, and by pulling the pushed image back from the registry. TwoExplicitLists_IntersectToTheCommonLibraries compared a sorted actual against an unsorted hardcoded expected, so it only passed when the randomly generated library GUIDs happened to sort that way - it failed about half of all runs and would have made CI intermittently red. The intersection is a set, so it now asserts on membership and count rather than ordering. Confirmed with 10 consecutive clean runs, up from ~50%.