[WALDEX451]

Changes

• Promote the tested beta code to version 2.0.0.
• Update the README and release notes to describe the stable source release and platform status.

Verification

• Beta source: Python smoke test and JavaScript syntax check passed locally and in GitHub Actions.
• Windows EXE built with PyInstaller 6.22.3 and passed its bundled startup self-test.
• This branch only changes the version and documentation; the code remains the tested beta code.

macOS DMG validation remains outstanding and is not claimed as part of this release.