v0.5.1

Fixed

• Inline code invisible in dark mode (superhero theme) — added CSS override.
• README rendered Quarto YAML frontmatter as raw text on GitHub — removed it.

Added

• Zenodo DOI badge in README.
• Sandstone (light) / Superhero (dark) theme switching in docs.

Full Changelog: v0.5.0...v0.5.1