* fix(skills): support parsing multiline YAML strings in SKILL.md frontmatter * test(skills): add tests for multiline YAML descriptions
Cover parse_skill_file logic: - Valid SKILL.md parsing with all fields - Missing required fields (name, description) return None - Missing/wrong filename returns None - Optional license field handling - Custom and default relative_path behavior - Colons in description values - Empty front matter handling Co-authored-by: Willem Jiang <willem.jiang@gmail.com>