Why: Increment four landed across the chain (native #19/#20, backend #72, squad #18, backend #73); Dev pins must point at those merged component main heads. Evidence: check-pins exit=0; native c9c2f23, squad 7ecc04e and backend 303983bd are direct merge commits on their component mains. Impact: Three gitlinks. Refs: Agent-Native PR #19/#20; Agent-Squad PR #18; Agent-System-Backend PR #72/#73