Progress tree methodology — single source of truth location matrix, frontmatter discipline, tree expansion protocol, and new-session handoff generation for project progress tracking. Use when creating a new progress file, opening a child subtree, generating a handoff prompt for a fresh session, or auditing an existing project for progress-file drift. Answers "where does the progress file live", "when do I open a child", and "how does a new session continue the work". Pairs with progress-hygiene-rules for MUST/NEVER constraints. MUST read SKILL.md BEFORE creating, moving, or restructuring any progress file.
2026-04-21