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>

web/tests/fixtures/create-object-editor-input.py

@@ -0,0 +1,36 @@
+import pathlib
+import sys
+
+import bpy
+
+
+root = pathlib.Path(__file__).resolve().parents[3]
+hierarchy = "--hierarchy" in sys.argv
+target = root / "tests/files/web" / (
+    "object_editor_visibility_scene.blend" if hierarchy else "object_editor_scene.blend")
+if target.exists():
+    raise RuntimeError("Fixture already exists; retain the existing hash-bound input")
+bpy.ops.wm.open_mainfile(filepath=str(root / "tests/files/web/basic_scene.blend"))
+cube = bpy.data.objects["BasicCube"]
+cube.location = (3.0, -2.0, 5.0)
+cube.rotation_mode = "XYZ"
+cube.rotation_euler = (0.2, 0.4, 0.6)
+cube.scale = (1.5, 2.0, 0.5)
+if hierarchy:
+    collection = bpy.data.collections["Collection"]
+    nested = bpy.data.collections.new("ObjectEditor Nested")
+    collection.children.link(nested)
+    camera = bpy.data.objects["BasicCamera"]
+    collection.objects.unlink(camera)
+    nested.objects.link(camera)
+    alternative = bpy.data.collections.new("ObjectEditor Alternative")
+    bpy.context.scene.collection.children.link(alternative)
+    alternative.objects.link(bpy.data.objects["BasicArea"])
+    hidden = bpy.data.objects.new("ObjectEditor Hidden", None)
+    hidden.hide_viewport = True
+    alternative.objects.link(hidden)
+bpy.context.view_layer.update()
+for obj in bpy.context.view_layer.objects:
+    obj.select_set(obj == cube)
+bpy.context.view_layer.objects.active = cube
+bpy.ops.wm.save_as_mainfile(filepath=str(target))