- Locked layers can't be selected (Timeline click, Select All, Ctrl+Up/Down; shy layers while
hidden too) and are left alone by Clear/Delete, Arrange, Layer ▸ Transform and Center Anchor
Point, which fail when every target is locked (`commands::unlocked`, `commands::selectable`).
- Deleting a parent unparents its children where they are, in the same undo step: the
pick-whip compensation moved out of `layer.setParent` into `layer::parent_fixes` /
`ParentFix::apply`, which now also handles separated X/Y Position.
- Bring Forward / Send Backward move each selected layer one step (a non-contiguous selection
was squeezed into one block).
- Center In View / Fit to Comp keep a 3D layer's Z (and Fit keeps Scale/Anchor Z); Reset /
Center / Fit / Center Anchor Point work with separated dimensions (`layer::update_position`).
- Duplicate and paste keep parents and track mattes, following the copies when both were
copied; paste dropped them always.
- Docs: agents, parity.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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