- frontmatter get: all fields, specific field, missing field, missing file, no frontmatter - frontmatter set: update existing, add new, JSON array value, missing file, body preservation - Per-test temp file creation and cleanup pattern
- frontmatter get: all fields, specific field, missing field, missing file, no frontmatter - frontmatter set: update existing, add new, JSON array value, missing file, body preservation - Per-test temp file creation and cleanup pattern