Unify cel editing in the timeline

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Your Name 2026-10-01 14:37:59 -04:00
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# The Lane Model
Revised 2026-09-30. Target design. Cel ownership, source playback, the
content and cel commands, placement anywhere in a lane, overwrite, a one-row cel
strip, a frame-down cel sheet, correction evaluation, and correction authoring
for rotation and position are implemented. Retiming commands are not.
Revised 2026-10-01. Cel ownership, source playback, one-row drawing lanes,
direct clip movement and edge editing, correction evaluation, and correction
authoring for rotation and position are implemented. The former cel-sheet
projection was removed: the timeline is the single timing interface. Sections
below that describe a cel sheet are retained as design history and are superseded
by this revision. Retiming commands are not.
See the status note under
[Proof obligations](#proof-obligations-and-implementation-order).