docs(issue): archive legacy issues and add iss-015

mvp/architecture/archive/2026-07-05-legacy/current-mvp-architecture.md

@@ -209,7 +209,7 @@ Deferred future enhancements:
 
 ## 10. Supporting Materials
 
-- `mvp/issues/rag-refactor-plan.md`
+- `mvp/issues/archived/rag-refactor-plan.md`
 - `eval/rag-retrieval/README.md`
 - `scripts/eval_rag_live_acceptance.py`
 - `interview/rag-refactor-story.md`

mvp/architecture/archive/2026-07-22-legacy/rag-architecture.md

@@ -2,7 +2,7 @@
 
 **更新日期**：2026-07-06
 **状态**：当前主架构 + 后续演进边界  
-**关联计划**：[`mvp/issues/active/rag-refactor-plan.md`](../issues/active/rag-refactor-plan.md)
+**关联计划**：[`mvp/issues/archived/rag-refactor-plan.md`](../../../issues/archived/rag-refactor-plan.md)
 
 ## 1. 架构目标