docs: Archive osmassets refactor plan

.trellis/tasks/08-03-archive-refactor-plan/task.json

@@ -0,0 +1,30 @@
+{
+  "id": "archive-refactor-plan",
+  "name": "archive-refactor-plan",
+  "title": "Archive refactor plan",
+  "description": "Move completed osmassets refactor-plan conclusions into changelog and remove the stale temporary plan.",
+  "status": "in_progress",
+  "dev_type": "docs",
+  "scope": "docs/spec",
+  "package": null,
+  "priority": "P2",
+  "creator": "dingkang",
+  "assignee": "dingkang",
+  "createdAt": "2026-08-03",
+  "completedAt": null,
+  "branch": null,
+  "base_branch": "main",
+  "worktree_path": null,
+  "commit": null,
+  "pr_url": null,
+  "subtasks": [],
+  "children": [],
+  "parent": null,
+  "relatedFiles": [
+    "docs/changelog.md",
+    "docs/refactor-plan.md",
+    ".trellis/spec/guides/artifact-parity-guide.md"
+  ],
+  "notes": "Lightweight docs cleanup. Remove stale temporary refactor plan after merging durable conclusions into changelog/spec.",
+  "meta": {}
+}