v0.4.0 — Debate progress in the flowchart

• Debate progress in the flowchart. A debate node now carries one pip per allowed round — filled as rounds commit, pulsing on the round in flight — plus an outcome line: ✓ consensus · round 3 (green), ✕ no consensus · cap hit (amber), or round 2 of 4… while running. Applies to any step checkpointing a steps.{id}.transcript array, so hand-rolled debate recipes get it too.
• Debate tab. The transcript stays out of the way: a sidebar tab (shown only when a debate exists) with the outcome strip, the judge's verdict, and each round behind a collapsed accordion. Accordions keep their open state across polls; clicking the debate node switches to the tab.
• Compatibility: allow timmcleod/agent-workflows ^0.11 (the debate() release).