release: prepare Desktop 0.13.13

Prepare a Desktop-only patch for repeated activity-history reads during streaming and the supervision feedback sidebar layout. Keep Agent 0.13.3 and the database format unchanged; no Host update is required.

Update bilingual release notes, feature matrices, and validation evidence. Isolate this candidate from the original worktree and exclude its uncommitted supervision timeout tests. Validation passed 192 focused tests, an additional six-case Electron sidebar scenario, typecheck, lint, and release-note checks.

Release note: 减少流式活动历史的重复读取，修复监督反馈侧栏的按钮布局和目标名称显示；Agent 保持 0.13.3。

resources/release-notes.json

@@ -1,6 +1,34 @@
 {
   "formatVersion": 1,
   "releases": [
+    {
+      "version": "0.13.13",
+      "releasedAt": "2026-09-23",
+      "notes": {
+        "zh-CN": {
+          "highlights": [],
+          "features": [],
+          "fixes": [
+            "**减少流式活动历史的重复读取**：活动历史较多时，连续保存流式更新不再每次重新读取整份历史。保留已有记录与顺序，保存失败后仍可重试。",
+            "**修复监督反馈侧栏布局**：固定目标与刷新操作使用标题旁的紧凑按钮，目标显示会话或任务名称。长标题和窄侧栏下保持内容可读，并保留键盘焦点提示。"
+          ],
+          "notices": [
+            "本次仅更新 Desktop，Agent 保持 **0.13.3**，无需因此更新 Host 环境。从 Desktop 0.13.12 升级不新增数据库格式迁移。"
+          ]
+        },
+        "en-US": {
+          "highlights": [],
+          "features": [],
+          "fixes": [
+            "**Reduce repeated activity-history reads during streaming**: With a large activity history, consecutive streaming saves no longer reread the entire history on every update. Existing records and ordering are preserved, and failed saves remain retryable.",
+            "**Fix the supervision feedback sidebar layout**: Pin and refresh actions now use compact buttons beside the heading, and targets show conversation or task names. Long titles remain readable in narrow sidebars, with visible keyboard focus."
+          ],
+          "notices": [
+            "This release updates Desktop only. Agent remains at **0.13.3**, with no Host update required for these fixes; upgrading from Desktop 0.13.12 adds no database format migration."
+          ]
+        }
+      }
+    },
     {
       "version": "0.13.12",
       "releasedAt": "2026-09-23",