Agent Skills: resonance-ops-explain

Teaches the operator, not the repo. Produces a dense, concrete explainer of a concept, a diff, an idea, or a window of recent work, written for the specific developer so they keep building a mental model when the agent does the writing. Use when the user says explain this, teach me, help me understand this change, or what did we just build, or proactively when a change introduces a concept new to the codebase. Offers an optional predict-then-reveal check-in for active recall.