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* feat(commands): add handoffs support for speckit compatibility - Upgrade frontmatter parser to use js-yaml for complex YAML support - Add HandoffDefinition interface for speckit-style workflow transitions - Update CommandFrontmatter and CommandDefinition to include handoffs - Add comprehensive tests for backward compatibility and complex YAML - Fix type parameters in auto-slash-command and slashcommand tools Closes #407 * fix(frontmatter): use JSON_SCHEMA for security and add extra fields tolerance tests - Use JSON_SCHEMA in yaml.load() to prevent code execution via YAML tags - Add tests to verify extra fields in frontmatter don't cause failures - Address Greptile security review comment --------- Co-authored-by: sisyphus-dev-ai <sisyphus-dev-ai@users.noreply.github.com>