Couldn't even open TMC in VS code

Reproduce the failure in the reported Windows and VS Code environment, using the logged tmc-langs CLI invocation as the starting point. Trace the activation path through _executeLangsCommand and _spawnLangsProcess in dist/lib.js, then verify that the extension can start and run the logged-in check without spawn EBUSY.

[2025-07-25 21:14:26:118] [INFO] Starting moocfi.test-my-code in "production" mode.
[2025-07-25 21:14:26:118] [INFO] Visual Studio Code version: 1.102.2
[2025-07-25 21:14:26:118] [INFO] moocfi.test-my-code version: 3.4.0
[2025-07-25 21:14:26:118] [INFO] Currently open workspace: python
[2025-07-25 21:14:26:118] [INFO] Platform win32 Arch x64
[2025-07-25 21:14:26:118] [INFO] TMC-Langs version: tmc-langs-cli-x86_64-pc-windows-msvc-0.38.0.exe
[2025-07-25 21:14:26:686] [ERROR] Mismatch between CLI and checksum, trying redownload
[2025-07-25 21:14:26:702] [INFO] Downloading TMC-langs from https://download.mooc.fi/tmc-langs-rust/tmc-langs-cli-x86_64-pc-windows-msvc-0.38.0.exe to temporary file c:\Users\kairy\AppData\Roaming\Code\User\globalStorage\moocfi.test-my-code\cli\temp-tmc-langs-cli-x86_64-pc-windows-msvc-0.38.0.exe
[2025-07-25 21:14:29:882] [INFO] Running "c:\Users\kairy\AppData\Roaming\Code\User\globalStorage\moocfi.test-my-code\cli\tmc-langs-cli-x86_64-pc-windows-msvc-0.38.0.exe" "tmc" "--client-name" "vscode_plugin" "--client-version" "3.4.0" "logged-in"
[2025-07-25 21:14:29:882] [DEBUG] TMC backend at https://tmc.mooc.fi
[2025-07-25 21:14:29:882] [DEBUG] MOOC backend at https://courses.mooc.fi
[2025-07-25 21:14:29:882] [DEBUG] Config dir at undefined
[2025-07-25 21:14:29:885] [ERROR] Fatal error during initialization:
Error: spawn EBUSY.

Error: spawn EBUSY
at ChildProcess.spawn (node:internal/child_process:420:11)
at Object.spawn (node:child_process:787:9)
at u._spawnLangsProcess (c:\Users\kairy.vscode\extensions\moocfi.test-my-code-3.4.0\dist\lib.js:2:747076)
at u._executeLangsCommand (c:\Users\kairy.vscode\extensions\moocfi.test-my-code-3.4.0\dist\lib.js:2:745072)
at u.isAuthenticated (c:\Users\kairy.vscode\extensions\moocfi.test-my-code-3.4.0\dist\lib.js:2:736432)
at c:\Users\kairy.vscode\extensions\moocfi.test-my-code-3.4.0\dist\extension.js:1:1714
at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
at async r.activate (c:\Users\kairy.vscode\extensions\moocfi.test-my-code-3.4.0\dist\extension.js:1:1063)
at async db.n (file:///c:/Users/kairy/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:112:13386)
at async db.m (file:///c:/Users/kairy/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:112:13349)
at async db.l (file:///c:/Users/kairy/AppData/Local/Programs/Microsoft%20VS%20Code/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:112:12805)