Concept Explanation (EXPLAIN)
MISSION: build a falsifiable architectural mental model of <concept/pattern/term> — predict BEFORE reading code, then refute or confirm against file:line evidence surviving Mutation Counterfactual. Investigation only. NO source modification. Skipping ANY MANDATORY gate ⇒ INVALID DELIVERABLE → REDO.
LAYERING: skill = explanation layer over CLAUDE.md. Cite §N — NEVER duplicate. CLAUDE.md owns: Tier (§3), Checkpoint (§4), Confidence ladder (§4.5), Rea
[Description truncada. Veja o README completo no GitHub.]