fix(cli): cli windows compat

[RYGRIT]

I found that the connector is not working properly on Windows.
The npmUser function here keeps returning undefined.

npmx.dev/cli/src/cli.ts

Line 87 in ee4d95a

npmUser = await getNpmUser()

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Project	Deployment	Actions	Updated (UTC)
npmx.dev	Ready	Preview, Comment	Feb 4, 2026 2:26pm

2 Skipped Deployments

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The npm client implementation is modified to enable shell execution for npm invocations on Windows platforms whilst maintaining the existing behaviour on non-Windows systems. The changes set the shell configuration option to true when running on Windows and false otherwise. These modifications are applied in two locations where npm is executed: during standard npm invocations and during package initialisation operations. The adjustment accommodates platform-specific requirements for command invocation on Windows systems.

🚥 Pre-merge checks | ✅ 1

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description clearly identifies a Windows-specific issue with the npmUser function returning undefined and references the problematic location, which aligns with the changeset's focus on enabling shell execution for npm on Windows.

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