docs: Archive osmassets refactor plan

.trellis/tasks/08-03-archive-refactor-plan/check.jsonl

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+{"file": ".trellis/spec/guides/artifact-parity-guide.md", "reason": "Check that parity/control knowledge survives after deleting the temporary refactor plan."}
+{"file": ".trellis/spec/guides/index.md", "reason": "Check guide references remain accurate and no stale refactor-plan links remain."}

.trellis/tasks/08-03-archive-refactor-plan/implement.jsonl

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+{"file": ".trellis/spec/guides/artifact-parity-guide.md", "reason": "Contains refactor-plan status and references that must be preserved without linking to the deleted temporary file."}
+{"file": ".trellis/spec/guides/index.md", "reason": "Shared guide routing for cross-layer and parity documentation changes."}

.trellis/tasks/08-03-archive-refactor-plan/prd.md

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+# Archive refactor plan
+
+**类型**：docs · **范围**：docs/spec · **创建**：2026-08-03
+
+---
+
+## Goal
+
+收尾临时文档 `docs/refactor-plan.md`：把仍有价值的 P0-P3 重构结论并入长期文档，
+然后删除这份已过期的临时计划，避免后续 AI 或开发者读到 P3 未做、旧行号、旧 `CESIUM_EXPORT`
+状态等过期事实。
+
+## Requirements
+
+1. `docs/changelog.md` 必须新增一条 2026-08-03 记录，总结材质导出契约化、Trellis
+   spec 初始化，以及 `docs/refactor-plan.md` 的收尾处理。
+2. 删除 `docs/refactor-plan.md`，因为它开头已声明 P3 收尾后应并入 changelog 并删除。
+3. 更新 `.trellis/spec/guides/artifact-parity-guide.md` 中对 `docs/refactor-plan.md` 的
+   直接依赖，保留 parity/control 结论和 P0-P3 当前状态，但不引用已删除文件。
+4. 不改业务代码，不改 Blender/Cesium 产物，不修 D1-D3。
+5. 删除后不得留下指向 `docs/refactor-plan.md` 的断链引用。
+
+## Acceptance Criteria
+
+- [ ] `docs/refactor-plan.md` 不存在。
+- [ ] `docs/changelog.md` 顶部有 2026-08-03 条目，记录 P3 完成和临时计划归档。
+- [ ] `rg "docs/refactor-plan.md|refactor-plan" docs .trellis/spec README.md` 不再发现活文档引用。
+- [ ] `git diff --check` 通过。
+- [ ] 工作范围只包含 docs、`.trellis/spec` 和当前 Trellis task 文件。
+
+## Out of Scope
+
+- P2 要素注册表补完。
+- D1/D2/D3 修复。
+- 任何 `blender/`、`scripts/`、`config/` 业务代码改动。

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

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+{
+  "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": {}
+}