Feature File Management Manage - a waterfall-style planning document combining structured requirements tracking with incremental development. Quick Reference See for complete field documentation. Proactive Usage This skill should be used automatically when features.yml exists. Before Starting Implementation 1. Check if exists in project root 2. If missing: do not use this skill proactively (stop here) 3. Plan the work in features.yml before writing code: - Add/update the feature with all requirements extracted from the user's request - Add anticipated test cases to (with ) - Document design d…