Fix Windows path separator handling

[hoklims]

What changed

• replace the platform-derived regular expression with a separator expression that safely handles both \ and /
• add a regression test covering Windows and POSIX paths

Why

On Windows, path.sep is \. Passing it directly to new RegExp() creates an invalid regular expression and crashes scip-python during module initialization. This addresses #210.

Accepting both separators also keeps package resolution robust when Python metadata contains mixed path styles.

Validation

• npm test -- --runInBand — 2 suites, 8 tests passed
• npm run check:prettier — passed
• npm run build-agent — passed
• native Windows indexing smoke — generated a SCIP index containing all 8 expected Python documents

[Copilot]

Pull request overview

Fixes a Windows startup crash in pyright-scip by removing the platform-derived RegExp(path.sep) (which is invalid on Windows) and replacing it with a safe separator-matching regex that works across both Windows (\) and POSIX (/) path styles.

Changes:

• Replace new RegExp(path.sep, 'g') with a safe cross-platform separator regex (/[\\/]/g).
• Add a regression test ensuring module resolution works with both Windows-style and POSIX-style separators in package file paths.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/pyright-scip/src/virtualenv/PythonEnvironment.ts	Uses a safe, cross-platform separator regex to avoid Windows RegExp initialization crashes and handle mixed path styles.
packages/pyright-scip/src/virtualenv/PythonEnvironment.test.ts	Adds coverage to confirm module resolution works for both \ and / separators.

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