checkpoint

Validate an Arcgram diagram as a logic spec: is the flow well-formed and coherent? Reads node/edge structure (id/f/t/kind/role/type), never geometry. Typed findings — dangling edge, orphan node, missing branch, disconnected island, duplicate id, missing schema, plus optional coherence (every action traces to a goal). Marks, never blocks. Run after authoring or editing a diagram. Agent-neutral. Sibling to Reconcile…