Constant, ramp, and return offsets now append ordinary channel layers to a lane or cel in explicit owner frames. The inspector exposes the commands as one undoable transaction, shows conflicts, and offers removal or retry while preserving generated bases through regeneration.
Ordered-stack compatibility is shared by validation, conflict reporting, and regeneration, including adjacent replacement coverage. Cel-sheet gaps and headers select their lane, so commands cannot fall through to another column's stale selection.
437 tests, 5,804 assertions; both browser flows; 56 Django tests; optimized frontend build.
The cel sheet is a second projection of the same lane rows: frames run down, lanes run across, and each occupied cell carries the timeline cel's exact selection address. The shared action strip proves the point in the browser test by selecting a cell and issuing the existing hold command.
Before exposing that second entrance, fix the boundary mistakes it revealed. Nested commands now convert the open playhead through their enclosing instance path. Overwrite composes blanking with non-rippling placement as one transaction. Picture-rate and pose sampling select only the generated base frame while hand corrections retain the node's authored frame. Stack validation follows covering replacement layers so a document accepted by the validator cannot throw solely because a later offset sees a different shape.
429 tests, 5,767 assertions; both browser flows; 56 Django tests; optimized frontend build.
`docs/lane-handoff.md`, after `timing-handoff.md`'s shape, because the next
thread starts cold and the expensive part of that is not the code — it is the
decisions that were argued out and would otherwise be argued again.
So the section that matters most is the one listing what NOT to re-litigate:
the shot length is authored, placing ripples and overwrite is blank-then-place,
a position inside a cel refuses and names split, a correction has no time space
of its own, a layer's values are a channel, a conflict is not a problem, and a
command refuses rather than guesses. Each of those is a paragraph here and a
commit message in full.
Then the vocabulary, since it was settled one commit ago and the old words are
still in this repository's history: instance, cel, lane, drawing, and placement
for where a node sits only. With the warning that `exposure` still means the
`:expose` grid and always did.
Then the mechanisms that keep paying out — `:span` in the node's own frames
above all, which is why split, trim and blank cost almost nothing — the known
gaps, and how to run the suites, including that a release build clobbers the dev
bundle the browser tests need.
Recommended next piece is the cel sheet: it needs no new model, and it is the
first real evidence the document is not shaped by the timeline that grew up
with it.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
