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/diagnostic-report.ts

@@ -12,6 +12,10 @@ export const APP_DIAGNOSTIC_MESSAGES = {
   STORAGE_CLEANUP_FAILED: "Storage: cleanup failed",
   OPERATION_LOG_FAILED: "Storage: operation log unavailable",
   COMMAND_FAILED: "Engine: command failed",
+  EDITOR_CONTEXT_FAILED: "Engine: editor context unavailable",
+  PBR_ASSET_UNAVAILABLE: "PBR asset unavailable",
+  PROJECT_RECOVERY_COMMIT_UNAVAILABLE: "Storage: project recovery commit unavailable",
+  PROJECT_REPLACEMENT_SAVE_FAILED: "Storage: save before project replacement failed",
   IMAGE_IMPORT_FAILED: "Image import failed",
   GREASE_PENCIL_EDIT_FAILED: "Grease Pencil edit failed",
   CURVE_EDIT_FAILED: "Curve edit failed",
@@ -34,6 +38,7 @@ export const APP_DIAGNOSTIC_MESSAGES = {
   GLB_EXPORT_BLOCKED: "GLB: export blocked",
   GLB_EXPORT_FAILED: "GLB: export failed",
   AUTOSAVE_FAILED: "Engine: autosave failed",
+  AUTOSAVE_CHECKPOINT_FAILED: "Storage: checkpoint creation failed",
 } as const;
 
 export type AppDiagnosticCode = keyof typeof APP_DIAGNOSTIC_MESSAGES;