[IOHelpMe]

Summary

• use shell-portable double quotes for package build and watch filters
• add regression coverage that executes both scripts through the host shell
• normalize JCO-generated WIT paths on Windows while preserving POSIX paths
• add regression coverage for Windows and POSIX WIT output paths

Testing

• npm test (9 files, 16 tests passed)
• npm run build -- --dry=json (6 packages selected after the current main merge)
• git diff --check

Scope

This PR contains the two related Windows build fixes used by the native Docker VMM workflow: Turbo package filtering and JCO WIT path normalization.

[druid-infra]

Error: This repo is not allowlisted for Atlantis.

[IOHelpMe]

@MarcStdt This is now rebased/merged onto current main, the title/body match both Windows fixes, and CI is green on Node 20, 22, and 24. Ready for review.