v0.4.0 of ethos

Measure accessibility coverage in Flutter apps using WCAG 2.2 specifications with Spec-Driven Development. Changelog excerpt: - Improved compatibility with newer analyzerversions (up to 13.x), ensuring Ethos works reliably across supported releases. - Added official desktop platform support (Windows, macOS, and Linux) and resolved analyzer/lint-related issues. - Significantly enhanced color contrast detection by automatically extracting colors from ThemeDataand supporting custom color_aliasesin ethos.yaml, reducing indeterminate results in real-world applications. - Introduced ColorAliasand `T[...]