v0.6.2

This additive 0.x patch broadens compatibility and tidies the docs pipeline.

• Wider nr-llm support — the extension now accepts nr-llm ^0.23 alongside the existing ^0.22, so installs on either line resolve cleanly.
• Documentation CI — adds a dedicated docs workflow and normalizes the guides version, keeping the rendered documentation in step with the release.
• Carried through this line — branded backend icons and backend dark-mode support.

This is a non-breaking, additive 0.x patch, so downstream consumers pinning a caret range on this package (^0.6) pick it up automatically. Cowriter is the one dependency tracked on a >=1.0 line.