Added the Scene Manager (Libreflow casting, load, update, assetize)

New Scene Manager panel (WTD tab) talking to a running Libreflow through
its IPC server and the wtdcmds commands: pick the shot context, read the
casting, link the latest available publishes (overrides for chars and
props, collection instances otherwise), flag out-of-date versions in red,
update / roll back / remove loaded assets, and publish local collections
as assets. Requests run in the background. Settings in config.py
(SCENE_MANAGER_*, LIBREFLOW_*).

The Shot Viewer groups rigs loaded by the Scene Manager by asset type.
The manifest declares the network permission.

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

__init__.py

@@ -8,7 +8,7 @@ for _name in [name for name in sys.modules if name.startswith(__name__ + ".")]:
 import bpy  # noqa: E402
 from bpy.app.handlers import persistent  # noqa: E402
 
-from . import checks, core, rename, shot_viewer, tools_ops, ui  # noqa: E402
+from . import checks, core, rename, scene_manager, shot_viewer, tools_ops, ui  # noqa: E402
 from .core import runner  # noqa: E402
 
 api = core
@@ -49,6 +49,9 @@ def register() -> None:
     # Register the shot viewer (settings and operators, before its panel)
     shot_viewer.register()
 
+    # Register the scene manager (settings and operators, before its panels)
+    scene_manager.register()
+
     # Load all the sanity checks into the sanity REGISTRY
     checks.load_all()
 
@@ -80,6 +83,9 @@ def unregister() -> None:
     # Unregister the shot viewer (after its panel)
     shot_viewer.unregister()
 
+    # Unregister the scene manager (after its panels)
+    scene_manager.unregister()
+
     runner.clear()
     # The check registry is plain Python and is rebuilt with the modules on
     # re-import, so it is kept as is (enable/disable without re-import).