memento-skill

Activate on **EVERY SESSION**. Maintain a per-repo `.memento/` directory as an agent-owned, high-signal context scratchpad. **Always consult** `.memento` at the start of work. **Only update** `.memento` when the insight is high-signal, repo-specific, and likely to matter again. This is not documentation. It is a curated set of durable, project-shaping learnings from user steering, reversals, mistakes, and discoveries.