Captain's log for the SoundCloud uploader landing. Written for the documentary
rather than the board: the story beat is that I spent a session and a half
picking a window on `POST /tracks` — killing three hypotheses one at a time,
each death feeling like progress — while a real, logged-in, past-the-wall
browser sat open with the actual upload form in it.

Also records the two catches that were PLN's, not mine: the chip-input tags, and
the MUI Select whose Private option my four probes all reported as absent.