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-modifier-stack-input.py

@@ -0,0 +1,17 @@
+import bpy
+import pathlib
+
+root = pathlib.Path(__file__).resolve().parents[3]
+bpy.ops.wm.open_mainfile(filepath=str(root / "tests/files/web/basic_scene.blend"))
+obj = bpy.data.objects["BasicCube"]
+array = obj.modifiers.new("Stack Array", "ARRAY")
+array.count = 2
+bevel = obj.modifiers.new("Stack Bevel", "BEVEL")
+bevel.width = 0.1
+bevel.segments = 2
+other = obj.copy()
+other.data = obj.data.copy()
+other.name = "StackTarget"
+bpy.context.scene.collection.objects.link(other)
+other.location.x = 4
+bpy.ops.wm.save_as_mainfile(filepath=str(root / "tests/files/web/modifier_stack_scene.blend"), check_existing=False)