[WIP] Fix assertion failure on Windows when loading varlock

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[BUG]: Assertion failure on Windows</issue_title>
<issue_description>### varlock version

v0.1.3

Steps to reproduce

Run varlock load on Windows with node v24.12.0

What is expected?

Environment variables are printed and the command exits successfully.

What is actually happening?

All varlock commands fail at the end with the same assertion failure:

> varlock load

✅ APP_ENV*
   └ "develop"
...
Assertion failed: !(handle->flags & UV_HANDLE_CLOSING), file src\win\async.c, line 76
 ELIFECYCLE  Command failed with exit code 3221226505.

System Info

System:
    OS: Windows 11 10.0.26100
    CPU: (32) x64 13th Gen Intel(R) Core(TM) i9-13980HX
    Memory: 26.39 GB / 63.68 GB
  npmPackages:
    @playwright/test: ^1.57.0 => 1.57.0
    @types/node: ~22.9.0 => 22.9.4
    eslint: 8.57.0 => 8.57.0
    prettier: ~2.8.8 => 2.8.8
    varlock: ^0.1.2 => 0.1.3

Any additional comments?

Fresh installs of everything. The same commands work flawlessly in Linux and Mac.</issue_description>

Comments on the Issue (you are @copilot in this section)

@philmillman Thanks for the report @MLNW, we'll take a look tomorrow

• Fixes [BUG]: Assertion failure on Windows #229

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[theoephraim]

@copilot try again