fix: integrate updater downgrade guard

.project-docs/10-decisions/decision-index.md

@@ -9,6 +9,7 @@
 | ADR-003 | Robot 配网页内扫描并连接 Windows/macOS 热点 | Accepted / implemented with physical release gates pending | 2026-08-16 | Robot Renderer、Host API、Electron Main、Windows WLAN、macOS CoreWLAN/CoreLocation | `adr-003-robot-in-app-hotspot-connection.md` |
 | ADR-004 | Works Square 统一拥有桌面认证生命周期边界 | Accepted / implemented | 2026-08-19 | Renderer、Host API、Electron Main、Works Square auth facade | `adr-004-square-auth-lifecycle-boundary.md` |
 | ADR-005 | Learning 采用运营精选项目目录、直接渲染经校验的 HTTPS README 图片、下载不做大小校验并退役课程运行时 | Accepted / implemented, amended 2026-08-20 | 2026-08-20 | Learning Renderer、Host API、Electron Main、Works Square operations/API | `adr-005-learning-project-catalog.md` |
+| ADR-006 | Makelore Code 以 Pi `0.84.2` 为唯一 runtime，Main 独占 worker/session/provider/lease，产品只暴露 Snapshot/Patch 合同 | Accepted / implemented | 2026-08-26 | Code Renderer、Host API、Electron Main、Pi runtime、Provider/resource、packaging | `adr-006-pi-runtime-hard-cutover.md` |
 
 ## Superseded Decisions