Withdrawn teams forfeit visibly through the bracket instead of becoming byes

A withdrawn team stays in any slot whose opponent is not known yet and forfeits
when they arrive; the board strikes the name through and tags the match
'Forfeit · Team'. Release 0.5.1.

Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_01MB7nCCAscYsb3zzkT6LHZi

engine/tournament.js

@@ -179,6 +179,12 @@ export class Tournament {
     const next = this.match(matchId);
     if (!next) return;
     next[side === 'A' ? 'teamA' : 'teamB'] = teamId;
+    // a withdrawn team was waiting here: it forfeits to the team that just arrived
+    if (next.autoForfeit && next.teamA && next.teamB && ['pending', 'on_deck'].includes(next.status)) {
+      const f = next.autoForfeit; delete next.autoForfeit;
+      if (this.teams.get(teamId)?.status === 'withdrawn') { next.status = 'void'; return; } // both gone
+      this.recordResult(next.id, [], { actor: 'system', forfeit: f });
+    }
   }
 
   _propagate(m) {
@@ -264,10 +270,12 @@ export class Tournament {
           m.court = null;
         }
       } else if (['pending', 'on_deck', 'live'].includes(m.status)) {
-        // bracket: opponent walks over, if known; otherwise the slot becomes a bye
+        // bracket: opponent walks over by forfeit. If the opponent isn't known yet, the withdrawn
+        // team stays in its slot marked autoForfeit and forfeits the moment the opponent arrives,
+        // so the bracket shows the forfeit rather than a silent bye.
         const opp = m.teamA === teamId ? m.teamB : m.teamA;
         if (opp) this.recordResult(m.id, [], { actor, forfeit: teamId });
-        else { const side = m.teamA === teamId ? 'A' : 'B'; m[side === 'A' ? 'teamA' : 'teamB'] = null; m.pendingBye = side; }
+        else m.autoForfeit = teamId;
         m.court = null;
       }
     }