Fix Windows test failures caused by hardcoded Unix PATH separator

[Copilot]

Closes #[issue_number]

Description

24 test suites were disabled on Windows with .skipIf(isWindows). Root cause: PATH environment variable constructed using Unix : separator instead of Windows ;.

Changes

• test/env/spawnProject.ts & test/env/globalSetup.ts: Replace hardcoded : with path.delimiter for cross-platform PATH construction
• test/node.test.ts & test/cli.test.ts: Remove all .skipIf(isWindows) guards (24 total)

// Before
PATH: `${process.env['PATH']}:${path.resolve(__dirname, '../../bin')}`

// After  
PATH: `${process.env['PATH']}${path.delimiter}${path.resolve(__dirname, '../../bin')}`

Node's path.delimiter returns : on Unix, ; on Windows.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Lots of tests are disabled on windows</issue_title>
<issue_description>There are many test suites that are disabled with .skipIf(isWindows). All tests should instead be passing on windows and whatever is causing them to fail should be fixed.</issue_description>

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

• Fixes Lots of tests are disabled on windows #2167

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