// Static DOT import fixture
strict digraph ContactNetwork {
  graph [label="DOT fixture", created="2026-07-01"];
  node [sample_type="case", active=true];
  edge [kind="contact"];

  Alpha [label="Case Alpha", viral_load=2.5];
  Beta [sample_type="contact", active=false];
  Gamma;

  Alpha -> Beta [distance=4.5, confirmed=true, origin="Contact.csv"];
  Beta -> Gamma [weight=7, kind="genetic"];
  Alpha -> Beta [distance=5, note="strict replacement"];

  subgraph cluster_followup {
    Delta [sample_type="contact"];
    Epsilon;
  }

  Beta -> { Delta Epsilon } [distance=2];
}