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/protocol/storage.ts

@@ -120,6 +120,7 @@ export interface StorageAssetRecord {
   bytes: number;
   mimeType: string;
   sourcePath?: string;
+  sourcePaths?: string[];
   path: string;
   createdAt: string;
   lastAccessAt: string;