release: prepare Desktop 0.13.7 and Agent 0.13.1

Prepare the approved bilingual Desktop 0.13.7 and Agent 0.13.1 release
notes, version locks, feature matrices, and Agent release notes. Package both
OpenCode and Continue in the compound Agent release and publish native
execution checklists for remote projects.

Fix Linux source validation by configuring Electron's chrome-sandbox helper
and running the full test suite under Xvfb without disabling sandboxing.

Release note: Desktop 0.13.7 adds paged canvas notes, HTTP OCR, managed app
navigation, remote Continue and execution checklists, while preserving
conversation history and improving remote/runtime recovery. Agent 0.13.1
ships OpenCode and Continue together with checklist delivery.

Validation: npm test passed; npm run typecheck passed; npm run lint passed;
npm run release:notes:verify passed; 22 release workflow tests passed. No
local production build or package was run. LoongArch preview is not included.

docs/pr-articles/2026-09-19-unreleased/review.md

@@ -5,10 +5,10 @@
 - 状态：**草稿，未发布，截图待补**。
 - 首次建档及检查日期：2026-09-19。
 - 按用户要求将原魔法笔记重点稿与常规更新稿合并，只保留一份[正文](./article.md)及本记录，原主题子目录稿件移除。
-- 目标 tag：未确定，使用 `unreleased`，不推测下一版本号。
-- 目标提交：`375b2159c80a56a4d76d7762f3ddcee6d7848c11`。
-- 基线：正式桌面 tag `v0.13.6`，对应 `a383b2d11f1e834a30b08b0786ca0398da849d95`；比较区间 `v0.13.6..375b215`，35 个提交。
-- HEAD 不在正式 tag 上；最近可达 Agent tag 为 `agent-v0.13.0`，不作为桌面比较基线，不代表新版 Agent 包已发布。
+- 目标 tag：桌面 `v0.13.7`，Agent `agent-v0.13.1`；截图和外部发布仍待完成。
+- 目标提交：发布资料候选提交待最终提交后填写；当前已推送基线为 `9836a4cc9d82144496250a0e3154316b4dd0d9c4`。
+- 基线：正式桌面 tag `v0.13.6`，对应 `a383b2d11f1e834a30b08b0786ca0398da849d95`；当前比较区间为 `v0.13.6..HEAD`，39 个提交。
+- 当前 HEAD 不在正式 tag 上；最近可达 Agent tag 为 `agent-v0.13.0`，Agent 比较区间为 `agent-v0.13.0..HEAD`，不代表新版 Agent 包已发布。
 - 最初核查时工作区干净；合并前只有本轮两篇文章、核查记录与索引改动。未修改产品代码，未创建提交、推送、tag 或外部发布。
 
 ## 选题与结构