Three things about a fresh install cost a measurement each, and none of them was written down: it downloads the real catalog, so job-band is 103px of a 439px screen and every vertical number is wrong; stopping that build returns cleanly and it **starts again within seconds**, so it has to be stopped immediately before a measurement rather than once at the start; and a library added over the bridge does not dismiss the first-run wizard, which then sits over whatever you are looking at with a correctly disabled button, reading exactly like a swallowed tap. Also the scoped-storage path that works, the appops grant whose absence sends the app to the system "All files access" screen on launch, and why EXPR='...' cannot carry an apostrophe -- a file path with one in it fails as a JavaScript error. The positional form takes a file.