[Windows] statusLine spawn lacks windowsHide — visible console popup steals focus on every refresh

Environment

• OS: Windows 11 (Chinese locale), Windows Terminal set as default terminal
• kimi-code: 0.39.0
• User config: custom statusLine command (a shell script), plus hooks

Symptom

Every statusline refresh spawns a visible console window (titled as a console host popup, hosted by Windows Terminal) that steals keyboard focus. With a custom statusLine this fires every few seconds, making the TUI nearly unusable.

Root cause (from source, v0.39.0)

The main hook/Bash spawn paths were fixed in #957 / #1466 (windowsHide → libuv CREATE_NO_WINDOW), but the statusline path was missed:

• apps/kimi-code/src/tui/utils/status-line-command.ts:46 — spawns cmd /d /s /c <statusline command> without windowsHide
• same file, line ~62 — the timeout taskkill spawn also lacks windowsHide

Same batch of remaining spawns missing windowsHide (worth auditing together):

• packages/agent-core/src/services/fs/fsSearchService.ts:183
• apps/kimi-code/src/utils/clipboard/clipboard-common.ts:73
• MCP stdio servers via StdioClientTransport (one flash per server start)

Evidence

Process-monitor capture at popup timestamps shows cmd.exe /d /s /c "...statusline.sh" parented to the kimi TUI process at each popup moment, 1:1.

Mechanism (verified by reproduction)

On Windows, when a parent process has no console and spawns a console-subsystem program without CREATE_NO_WINDOW, the OS allocates a new console, which the default terminal (Windows Terminal) surfaces as a popup window. Adding windowsHide: true fixes it — same pattern as #1466.

Impact

Any Windows user with a custom statusLine (or an MCP server via cmd) gets focus-stealing popups continuously. Especially confusing for non-technical users.

Local workaround (in case it helps triage)

We redirected ComSpec to a GUI-subsystem cmd shim so all shell-outs go through a windowless proxy (byte-level transparent). Works, but it's a user-side hack — the real fix belongs in these spawn sites.

Happy to test a nightly build.

Start with apps/kimi-code/src/tui/utils/status-line-command.ts and compare its statusline and timeout spawns with the windowsHide pattern from #1466. Check the remaining spawn sites named in packages/agent-core/src/services/fs/fsSearchService.ts, apps/kimi-code/src/utils/clipboard/clipboard-common.ts, and MCP StdioClientTransport. Done means Windows statusline refreshes and listed shell-outs no longer create focus-stealing console popups.