Adopted the complete workflow from the HCI Effects cargo publish
documentation rather than referencing it, making the steps explicit
and self-contained.
- Add CHANGELOG.md documenting 0.1.0 and 0.2.0 releases with contributor
credits and PR links
- Add README.md to each crate linking to the changelog
- Link READMEs in Cargo.toml files
- Add repository field to -sys crates that were missing it
- Update top-level README to reference changelog and reflect -sys crate split
- Document changelog update step in release process
