Add Chromium-only Blender WebEngine parity work

docs/status/W-038.md

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+# W-038 Status
+
+status: done_current_scope
+task: 实现场景增量
+
+## Implemented
+
+`web/protocol/scene-delta.ts` defines revisioned node add/update/remove, active
+object/frame changes and mesh/material/camera/light/animation resources.
+`diffSceneSnapshots` emits changed node and resource fields;
+`applySceneDelta` rejects stale base revisions and returns sorted immutable node
+arrays. The native C ABI computes the same minimal delta whenever a new
+`.blend` is opened, and the Worker exposes it through the `delta` request after
+validating the envelope. The command registry covers scene/frame state,
+modifier switches, mesh editing, material/UV authoring, keyframes/constraints
+and object hierarchy operations. Each command mutates Blender Main and returns
+the corresponding revisioned delta through `applyCommand`.
+
+## Accepted bounded scope
+
+SceneDelta now covers resource collections for meshes, materials, cameras,
+lights and animations in addition to nodes/frame/active object. Mesh payloads
+transfer separately so topology and attribute changes replace the associated
+resource envelope, while node-only changes stay in place. All declared
+authoring commands are Main-authoritative and covered by save/reopen. Fine-
+grained `MeshGeometryDelta` patches now transfer only changed byte ranges when
+field lengths stay stable; topology/attribute layout changes replace only the
+affected per-mesh envelope. The main-thread client applies patches immutably
+and retains unchanged mesh buffers.