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Update README and docs for 0.2.0 breaking changes master

- Update README to reflect the removal of deprecated `*_dir()` methods and the transition to `Option<PathBuf>` return types. - Add migration guide to help users upgrade from 0.1.x to 0.2.0. - Document dependency removals (`libc`, `eyre`) and simplified error handling. - Highlight `runtime()` fallback behavior changes for Linux. - Ensure consistency in examples and method descriptions across all documentation.


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