Deferred / offline linked library

In many production scenarios, especially in layout and shot-based workflows, certain linked libraries are not needed temporarily, but they remain a crucial part of the full scene structure.

A common example is a layout scene composed of multiple linked assets (characters, props, environments). When broken into individual shots, each camera view may only cover a portion of the scene. Despite this, all linked libraries are loaded, even if they are not contributing to the current shot — adding unnecessary memory and performance overhead.

💡 Requested Feature: An option to mark linked libraries or collections as "deferred" or "offline", so they:

1. Stay referenced in the file, preserving structure and relinking paths
2. Are not loaded or evaluated unless explicitly needed
3. Help lighten scenes during shot rendering, compositing, or review

This would bring Blender closer to workflows found in tools like Maya, Houdini, Katana which support deferred references for scalable, scene-wide asset management.