The groundwork for an in-app editor. Edits live in edits.json in the work
dir, which no stage produces, so no rebuild removes them. An edit is a
whole lyric line as the user left it, in seconds, so a rebuild with a new
BPM re-snaps it. grid lays the edits over the freshly generated notes
(neighbouring lines give way to an edited one), writes the result to
notes_final.json with warnings brought up to date, and charts that. When
the lyrics change, edits follow their lines by text and order; an edit
whose line's words changed is set aside as stale and reported, not applied.
Notes gain a kind, so golden, freestyle and rap notes can be charted. The
review endpoint returns the merged notes with their syllables, kinds and
edit state, plus the chart's beat grid. PUT/DELETE
/api/jobs/{id}/lines/{n} save and revert a line, DELETE
/api/jobs/{id}/stale/{n} discards a stale edit; each rewrites the work and
packaged charts in place with the tempo already chosen, so a save
re-encodes nothing.
branderson