using-arcgentic

Entry skill for the arcgentic plugin — establishes the four-role workflow (planning / dev+self-audit / external-audit / reference-tracking), the round state machine, and when to switch roles or dispatch sub-agents. Use when starting any session in a project that has .agentic-rounds/state.yaml present, OR when the user mentions arcgentic / round-driven development / external audit / four-role workflow.