Scene-based assets

Character and background entries now reference PackedScene resources. A scene may contain textures, video, Spine, Live2D, shaders, or custom nodes.

Character scenes should inherit KND_CharacterSceneBase and override _apply_status(resolved_status_name, original_status_name); the system calls it through apply_status(status_name). By default, actor change fades the character mount out, applies the state, and fades it in without duplicating the character scene. Story execution resumes after the transition finishes. See Change Actor State for configuration. Optional stage motion belongs in a KND_ActorMotionLayer scene whose AnimationPlayer animation names match KS motion names.

Background scenes should inherit KND_BackgroundSceneBase. Assign the scene to background_scene; add uniquely named KonadoCamera2D nodes when camera commands are needed. Built-in transitions are handled by KND_BackgroundTransitionLayer.

Configure the corresponding character_scene or background_scene in the resource list. Keep node paths stable and make scene roots fill their parent when they are UI-based.