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/operator-bridge-main.py

@@ -0,0 +1,31 @@
+"""Read browser Main and independently create the same cube in desktop Blender."""
+import json
+import pathlib
+import sys
+import bpy
+
+
+def vector(values):
+    return [round(float(value), 6) + 0.0 for value in values]
+
+
+def summary():
+    bpy.context.view_layer.update()
+    return [{"name": obj.name, "type": obj.type, "location": vector(obj.location),
+             "vertices": sorted(vector(v.co) for v in obj.data.vertices) if obj.type == "MESH" else [],
+             "faces": len(obj.data.polygons) if obj.type == "MESH" else 0}
+            for obj in sorted(bpy.data.objects, key=lambda obj: obj.name)]
+
+
+directory = pathlib.Path(sys.argv[sys.argv.index("--") + 1])
+states = {}
+for blend in sorted(directory.glob("*.blend")):
+    bpy.ops.wm.open_mainfile(filepath=str(blend))
+    states[blend.stem] = summary()
+bpy.ops.wm.open_mainfile(filepath=str(directory / "before.blend"))
+primitive = json.loads((directory / "primitive.json").read_text())["primitive"]
+operator = getattr(bpy.ops.mesh, "primitive_" + primitive + "_add")
+assert operator(size=2, location=(0, 0, 0)) == {"FINISHED"}
+bpy.context.active_object.name = "BridgePrimitive"
+states["expected"] = summary()
+(directory / "native.json").write_text(json.dumps(states, sort_keys=True, indent=2) + "\n")