The layer shortcuts with no menu item were missing. A new module,
`layer_nav_cmds`, adds six commands that walk the Layers panel's rows
(a group's row before its children, collapsed groups as one row):
Select Layer Above / Below (Alt+] / Alt+[), Select Top / Bottom Layer
(Alt+. / Alt+,), and Add Layer Above / Below to Selection
(Alt+Shift+] / Alt+Shift+[). They stop at the first and last rows,
never dirty the document, and are listed under Layer in Keyboard
Shortcuts so they can be rebound. Agents run them like any command.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
