Switch the region under Setup > Region, and offer China Apps

omarchy region cn|global switches an installed machine: cn upgrades,
trusts ArchLinuxCN through the rendered China config, records the
marker and links the developer mirrors, then refreshes pacman;
global undoes only what Omarchy made. The developer mirrors reach
new sessions only, so a terminal switch offers to log out.

Install > China Apps, shown only in China, installs WeChat, QQ,
Feishu, DingTalk, Tencent Meeting and WPS Office from the AUR and
sets up Tencent Docs, Yuque and Shimo as web apps.

manual/52-china.md describes the China region.

AGENTS.md

@@ -99,7 +99,9 @@ Exceptions are allowed for migration and package-helper scripts where the helper
 # Region
 
 - `/etc/omarchy/region` holds the region the installer derived from the timezone (`cn`); no file means Global. The profile lives in `default/regions/cn/`, its contract in `docs/regions.md`.
-- `install/config/region.sh` links the `cn` developer mirrors into `/etc` and `/.cargo` and refuses to replace a regular file it did not create.
+- `install/config/region.sh` links the `cn` developer mirrors into `/etc` and `/.cargo` and refuses to replace a regular file it did not create. It serves both the install (the marker) and `omarchy region cn|global` (`OMARCHY_REGION`), which also records or removes the marker; Global removes only the links it made.
+- `omarchy-region` prints the region (`Global` or `China`) and switches it. Nothing in `omarchy update` or migrations may change the region.
+- China-only menu rows carry `"when":"[[ \"$(omarchy-region)\" == \"China\" ]]"` on every row, not only the submenu, because search checks each row's own guard. User-facing docs: `manual/52-china.md`.
 
 # Config Structure