Remove much of the old legacy pose library: - Remove from the Pose & Armature menus. - Remove from the default keymap. - Pose Library panel in Armature properties: Add "(legacy)" to title. - Add note that the functionality of that panel is obsolete, with a button that opens the manual on the chapter of the new pose library. - Add button to convert the selected legacy pose library to pose assets. - The rest of the functionality is greyed out to further communicate it's been deprecated. It's still functional, though. Ref: T93405