at present there is no direct way, within supercollider, to automatically get the path of the current script for the lua process.
instead what i would do is have an engine command that accepts a full path to a soundfile. (e.g. /home/we/dust/code/convolver/lib/impulse.wav), and use the lua facilities to build the path from the current working directory (e.g. file = norns.state.path .. 'lib/impulse.wav')
Platform.resourceDir is not relevant.