Pulsar editor plugin rendering a track-aware HUD topbar
(role colors, LCXL spatial layout, header_comments). Was
sitting loose at ~/Work/Tools/pulsar-parvagues-hud with no
git; vendored into tools/ so the package travels with the
livecoding workspace and can be shared in one clone.

node_modules excluded; run `apm install` (or `npm install`)
inside the dir to set up.