fix(windows): hide the console window forked by the console-list agent

[Aikio (Aikiooo)]

What

WindowsPtyAgent.kill() calls _getConsoleProcessList(), which forks conpty_console_list_agent:

const agent = fork(path.join(__dirname, 'conpty_console_list_agent'), [ this._innerPid.toString() ]);

fork() inherits stdio, so on Windows that child is given a console of its own. The result is a console window appearing on screen every time a pty is killed. In an embedding application it can also take focus away from the host's window, which is how it surfaced for us.

Change

Pass windowsHide: true to that fork. The helper still gets a console — it needs one, because getConsoleProcessList() calls FreeConsole() and then AttachConsole(shellPid) — it just has no window.

fork() spreads its options through to spawn() (options = { __proto__: null, ...options, shell: false }), which honours windowsHide, so nothing else about how the helper is started changes.

Why the local is typed

windowsHide is honoured at runtime but is missing from @types/node's ForkOptions — still true on DefinitelyTyped master — so passing it inline does not compile against strict:

error TS2353: Object literal may only specify known properties, and 'windowsHide' does not exist in type 'ForkOptions'.

The options object is typed with a cast to keep the build green. Happy to send the DefinitelyTyped change instead and drop the cast if you'd prefer that first.

Verification

• npm run build (tsc, strict) and npm run lint pass.
• Full mocha suite: 57 passing, 0 failing, which includes kill › should kill the process tree on the path this touches (useConptyDll = false). It polls the real process tree and still sees it removed, so the console-list sweep is unaffected by hiding the console.
• The agent itself, queried directly against a live pty with and without the option, attaches either way and returns the shell pid in the list (45 ms vs 37 ms, no timeout).

Not covered here

• Feature request: hide the Windows console window for ConPTY child processes #937 asks for an opt-in windowsHide for spawned processes. This does not implement that. It only stops the window for the internal helper on kill, which no caller can currently suppress.
• ConPTY kill(): the console-list agent races the pseudoconsole teardown, so the leftover-process sweep never runs #952 is about this same fork losing its race with the pseudoconsole teardown, and about the child's stderr being inherited because fork() defaults to silent: false. This change doesn't address either; it only removes the window.