收紧窗口标题载荷边界

将 app.setTitle 标题长度和控制字符规则提升到共享 HostBridge 契约

让 H5 facade 和 Tauri 壳按共享窗口标题边界归一化载荷

增加标题边界测试和三端壳总门禁反查

同步宿主壳协议文档和共享决策记录

apps/desktop-shell/scripts/check-config.mjs

@@ -1130,6 +1130,10 @@ const sharedHostBridgePayloadLimits = {
     sharedContractSource,
     'HOST_BRIDGE_BADGE_COUNT_MAX',
   ),
+  HOST_BRIDGE_APP_TITLE_MAX_LENGTH: extractTsNumberConst(
+    sharedContractSource,
+    'HOST_BRIDGE_APP_TITLE_MAX_LENGTH',
+  ),
   HOST_BRIDGE_CLIPBOARD_TEXT_MAX_LENGTH: extractTsNumberConst(
     sharedContractSource,
     'HOST_BRIDGE_CLIPBOARD_TEXT_MAX_LENGTH',
@@ -1192,6 +1196,10 @@ const desktopHostBridgePayloadLimits = {
     rustHostSource,
     'BADGE_COUNT_MAX',
   ),
+  HOST_BRIDGE_APP_TITLE_MAX_LENGTH: extractRustNumberConst(
+    rustHostSource,
+    'WINDOW_TITLE_MAX_LENGTH',
+  ),
   HOST_BRIDGE_CLIPBOARD_TEXT_MAX_LENGTH: extractRustNumberConst(
     rustHostSource,
     'CLIPBOARD_TEXT_MAX_LENGTH',