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>

tests/files/web/b3_obj_bundle_v1/materials/paint.mtl

@@ -0,0 +1,3 @@
+newmtl Painted
+Kd 1 1 1
+map_Kd ../textures/albedo.png

tests/files/web/b3_obj_bundle_v1/triangle model.obj

@@ -0,0 +1,9 @@
+mtllib materials/paint.mtl
+v 0 0 0
+v 1 0 0
+v 0 1 0
+vt 0 0
+vt 1 0
+vt 0 1
+usemtl Painted
+f 1/1 2/2 3/3