Remove unused HashMap import from mod.rs, use contains() instead of iter().any() in frontmatter.rs, add HashMap import to test module. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Remove unused HashMap import from mod.rs, use contains() instead of iter().any() in frontmatter.rs, add HashMap import to test module. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>