- Enhanced frontmatter parser to detect and parse TOML format - Added TOML format detection heuristics before YAML parsing - Created TOML test fixture with nested sections - Fixed parsing order to prevent TOML-to-string conversion - All frontmatter formats (YAML, JSON, TOML) now fully supported - Validated all acceptance criteria for Issue #41 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>