Scene Manager: request publishes missing on this site

- Request (globe) on casting rows and loaded assets whose latest publish
  is not on this site, and Request Missing for all of them, through the
  new wtdcmds command wtd_request_revisions. Requested publishes show
  "requested, waiting for the download".
- The version picker requests a version that is not on this site.
- A 404 explains that the session is gone or wtdcmds is too old.
- Fake server: car (vehicles) with a publish not on this site,
  wtd_request_revisions and /_test/download; 45 checks.
- Tested live: car_paul modeling.blend v001 -> Requested.

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

CLAUDE.md

@@ -42,7 +42,8 @@ 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>`
-     (36 checks, "All checks passed").
+     (45 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.
 
@@ -83,8 +84,10 @@ that contains this repo on `sys.path` and importing the repo folder name (see
 - Set dressing publishes (`setdress_low`) hold a whole layout scene: the set is the
   `environments` collection, next to `lights`, `cameras`, `characters`, `_unused`.
 - Tested live: connection, context, casting, load (instance and override), version switch
-  and update, remove, assetize errors. Not tested: an actual assetize publish (it writes
-  to production).
+  and update, remove, assetize errors, one request (`car_paul` modeling.blend v001 →
+  `Requested`). Not tested: an actual assetize publish (it writes to production).
+  New wtdcmds commands need every Libreflow session restarted (a running one keeps the
+  old code and answers 404).
 
 ## Open points