The remap commit carried counts. Counts do not help at the desk: a knob that
moved from C5 to B4 is a knob that does nothing when you reach for it. The
tracker now holds the was/now table for every one of the 24 moves, because
PLN is rehearsing jeudrill and rose_rouge tonight and both of them moved.

Also recorded: techno_orage's ^58 firing across d5 and d6, the corpus-wide
154-file job that is explicitly NOT for tonight, the 114 duplicate FIXME lines
left behind by the old non-idempotent tool, and the fact that "the set" still
resolves to the Opal list through backlog.md while Thursday's arc lives only
in armada/setlist_thu24.txt — a default nobody should trust this week.

Two fixes in the tool itself:

  * the FIXME dedupe was a snapshot taken before the insert loop, so one run
    could still stack two identical notes when an orbit is split across two
    blocks. It now learns as it writes.
  * the docstring still promised that buttons were "Phase 2, after the gig".
    They were folded in when #94 shipped, and the tool has been moving BT/BL
    cells ever since. A docstring that defers work the code already does is
    the one place a reader can learn the wrong scope.