feat(tests): add end-to-end tests for shell PTY and session management

CHANGELOG.md

@@ -11,6 +11,8 @@ Only write entries that are worth mentioning to users.
 
 ## Unreleased
 
+- Shell: Fix cancelled shell commands not properly terminating child processes — when a running command is cancelled, the subprocess is now explicitly killed to prevent orphaned processes
+
 ## 1.21.0 (2026-03-12)
 
 - Shell: Add inline running prompt with steer input — agent output is now rendered inside the prompt area while the model is running, and users can type and send follow-up messages (steers) without waiting for the turn to finish; approval requests and question panels are handled inline with keyboard navigation

docs/en/release-notes/changelog.md

@@ -4,6 +4,8 @@ This page documents the changes in each Kimi Code CLI release.
 
 ## Unreleased
 
+- Shell: Fix cancelled shell commands not properly terminating child processes — when a running command is cancelled, the subprocess is now explicitly killed to prevent orphaned processes
+
 ## 1.21.0 (2026-03-12)
 
 - Shell: Add inline running prompt with steer input — agent output is now rendered inside the prompt area while the model is running, and users can type and send follow-up messages (steers) without waiting for the turn to finish; approval requests and question panels are handled inline with keyboard navigation

docs/zh/release-notes/changelog.md

@@ -4,6 +4,8 @@
 
 ## 未发布
 
+- Shell：修复取消的 Shell 命令未正确终止子进程的问题——当运行中的命令被取消时，子进程现在会被显式杀死，防止产生孤儿进程
+
 ## 1.21.0 (2026-03-12)
 
 - Shell：新增内联运行提示与 steer 输入——模型运行时 Agent 输出直接渲染在提示区域内，用户无需等待轮次结束即可输入并发送后续消息（steer）；审批请求和问答面板支持内联键盘交互

src/kimi_cli/tools/shell/__init__.py

@@ -118,6 +118,9 @@ async def _read_stream(stream: AsyncReadable, cb: Callable[[bytes], None]):
                 timeout,
             )
             return await process.wait()
+        except asyncio.CancelledError:
+            await process.kill()
+            raise
         except TimeoutError:
             await process.kill()
             raise

tests/e2e/__init__.py

@@ -0,0 +1 @@
+