The player's tracker derefed its inputs one by one inside `ratom/run!`. An
edit that also changed the selection ran it from the selection's change: it
read `::render/shown` while still stale, then pulled the dirty
`::render/clip`, which re-ran it nested with the new resolver — and the outer
run, finishing last, wrote the old one back. A deleted layer stayed on the
stage until something else ran the tracker. The snapshot is now one sub, so
the tracker derefs a single clean input and is never re-entered.
Onion skinning only ghosted cels in `:display :lane` symbols, so a drawing
made of keyed shapes showed nothing. A ghost is now just the picture the
resolver draws n frames back and ahead, limited to the selection when there
is one. The scope setting is gone.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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