chore(task): archive 08-04-add-area-diagnostics

.trellis/tasks/archive/2026-08/08-04-add-area-diagnostics/task.json

@@ -3,7 +3,7 @@
   "name": "add-area-diagnostics",
   "title": "Add area diagnostics command",
   "description": "Add a fast area diagnostics CLI for OSM structure and existing output artifact health.",
-  "status": "in_progress",
+  "status": "completed",
   "dev_type": null,
   "scope": null,
   "package": null,
@@ -11,7 +11,7 @@
   "creator": "dingkang",
   "assignee": "dingkang",
   "createdAt": "2026-08-04",
-  "completedAt": null,
+  "completedAt": "2026-08-04",
   "branch": null,
   "base_branch": "main",
   "worktree_path": null,