Scene Manager: named LODs

{lod} in SCENE_MANAGER_LOD_COLLECTION now matches any name (COL_bob_LODhigh
as well as COL_bob_LOD0). SCENE_MANAGER_LODS (high, mid, low) sets the
button order and the LOD shown on load; unlisted LODs follow, numbers in
order, then names A-Z. It replaces SCENE_MANAGER_DEFAULT_LOD. The LOD of
Selected buttons get their own line.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CLAUDE.md

@@ -42,7 +42,7 @@ that contains this repo on `sys.path` and importing the repo folder name (see
   1. `blender -b --factory-startup --python dev/make_test_assets.py -- <workdir>`
   2. `python dev/fake_libreflow.py <workdir>` (keep running; restart for a clean state)
   3. `blender -b --factory-startup --python-exit-code 1 --python dev/test_scene_manager.py -- <workdir>`
-     (58 checks, "All checks passed"). `/_test/publish` and `/_test/download` simulate a new
+     (60 checks, "All checks passed"). `/_test/publish` and `/_test/download` simulate a new
      publish and a requested revision reaching this site.
   The fake server follows the real `wtdcmds` replies; check them against the real
   Libreflow when one is available.
@@ -72,7 +72,8 @@ that contains this repo on `sys.path` and importing the repo folder name (see
 - Removing a library leaves the libraries it linked indirectly (e.g. Blender's
   `geometry_nodes_essentials.blend`): `remove_unused_libraries()` drops the ones whose data
   is no longer used, never a managed library.
-- LODs are child collections of the asset collection (`COL_{asset}_LOD{n}`). Overrides
+- LODs are child collections of the asset collection (`COL_{asset}_LOD{lod}`, any name,
+  ordered by `SCENE_MANAGER_LODS`, then numbers, then names; the first is the default). Overrides
   switch by `hide_viewport`/`hide_render` on the LOD override collections: Blender stores
   them as override properties (kept through save, reload and resync) and hidden LODs are
   not evaluated. Collection instances instance the LOD collection itself. A second override's