release: finalize 0.15.0 validation and companion materials

Run conversation capture acceptance in a visible focused Electron window
and report concrete focus state on failure. Trigger Continue pre-spawn
cancellation at its existing environment callback instead of racing a timer.
Product implementation and approved bilingual note text remain unchanged.

Include the user's companion article updates and three reviewed draft images
as authorized. Keep their draft status and unverified build provenance clear.
Set the release date to September 28 and record the final real Linux result:
5345 passed, 51 skipped; Windows focused, typecheck, lint, and notes passed.

docs/quality/recurring-defects.md

@@ -49,6 +49,10 @@ AI 列 280。测试同步原生输入与实际状态后独立复跑通过，保
 随后 Linux CI 与共享 Host 的实测表明窗口焦点并不足够：缩窄窗口会收起工作栏，
 隐藏面板仍有非零宽度，Escape 实际发给工作栏开关。测试须等待响应式状态完成，
 按真实入口重新打开工作栏，并确认目标输入框取得焦点，再测试键盘返回和导航。
+验证输入框自动聚焦时，Electron 测试窗口也应从开始即显示并取得焦点，不要到后续
+键盘阶段才显示；失败信息应包含实际焦点、输入框禁用/可见状态及保存状态。
+取消边界测试不使用 `setTimeout(0)` 猜测异步 I/O 的完成次序。Continue 启动前取消
+用例改在既有启动环境回调处触发中止，仍断言未启动子进程及临时配置清理。
 
 ## 整窗遮罩与原生拖动区域