chore(task): archive 08-03-material-export-contract

.trellis/tasks/archive/2026-08/08-03-material-export-contract/task.json

@@ -3,7 +3,7 @@
   "name": "material-export-contract",
   "title": "Material export contract",
   "description": "Move Cesium material export overrides from export_cesium.py name tables into catalog-backed material contracts saved on Blender materials.",
-  "status": "in_progress",
+  "status": "completed",
   "dev_type": "refactor",
   "scope": "blender",
   "package": "blender",
@@ -11,7 +11,7 @@
   "creator": "dingkang",
   "assignee": "dingkang",
   "createdAt": "2026-08-03",
-  "completedAt": null,
+  "completedAt": "2026-08-03",
   "branch": null,
   "base_branch": "main",
   "worktree_path": null,