chore: checkpoint web Blender migration source, tools and docs

Accumulated uncommitted work: GHOST Web backend, WebGL/GPU web layer,
web workflow engine and protocol, tooling, docs and task records.
Large generated evidence, user-testing archives, build snapshots and
imported test assets remain untracked.

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

blender-5.2.0/scripts/startup/bl_ui/space_toolsystem_common.py

@@ -493,6 +493,11 @@ class ToolSelectPanelHelper:
 
     @classmethod
     def _km_action_simple(cls, kc_default, kc, context_descr, label, keymap_fn):
+        if (startup := bpy.utils._web_startup_state) is not None:
+            # Includes dynamic ToolDefs first materialized during startup. Keep
+            # their callable until the native keymap transaction is published.
+            startup.track_tool_helper(cls)
+            startup.track_tool_container(keymap_fn)
         km_idname = "{:s} {:s}, {:s}".format(cls.keymap_prefix, context_descr, label)
         km = kc.keymaps.get(km_idname)
         km_kwargs = dict(space_type=cls.bl_space_type, region_type='WINDOW', tool=True)
@@ -516,6 +521,8 @@ class ToolSelectPanelHelper:
 
     @classmethod
     def register(cls):
+        if (startup := bpy.utils._web_startup_state) is not None:
+            startup.track_tool_helper(cls)
         wm = bpy.context.window_manager
         # Write into defaults, users may modify in preferences.
         kc_default = wm.keyconfigs.default
@@ -1038,12 +1045,18 @@ def _activate_by_item(context, space_type, item, index, *, as_fallback=False):
 
     idname_fallback = (item_fallback and item_fallback.idname) or ""
     keymap_fallback = (item_fallback and item_fallback.keymap and item_fallback.keymap[0]) or ""
+    # `from_dict` stores a tuple key-map as `[builder_callable]` and only swaps in
+    # the real key-map name once the tool's key-map is registered. A workspace
+    # entered before that registration still holds the callable here, so only
+    # extend a real name instead of raising on `callable + str`.
+    if keymap_fallback and not isinstance(keymap_fallback, str):
+        keymap_fallback = ""
     if keymap_fallback:
         keymap_fallback = keymap_fallback + " (fallback)"
 
     tool.setup(
         idname=item.idname,
-        keymap=item.keymap[0] if item.keymap is not None else "",
+        keymap=item.keymap[0] if item.keymap is not None and isinstance(item.keymap[0], str) else "",
         cursor=item.cursor or 'DEFAULT',
         options=item.options or set(),
         gizmo_group=gizmo_group,