UR-Nexus 1.65.1

• Fixed ur selftest run reporting 0/5 anywhere but the UR repo. The drill
  runner spawned ./bin/ur.js, a path relative to the current directory, so
  every drill failed instantly with an empty detail — which reads as five
  broken features rather than one broken path. It now re-spawns
  process.execPath with process.argv[1], the exact pair this process was
  launched with, so it works from any directory and for a global install.
• Every existing test ran bun test from the repo root, where the relative
  path happens to exist, so all of them stayed green while the command was
  unusable in practice. Added a test that runs the drills from a temp
  directory; verified it fails against the old code and passes against the fix.