Allow group departures with bribe commitments

tests/coalition-nexus-engine.test.ts

@@ -88,7 +88,7 @@ void test('an unresolved prior-turn Truthtrance record still blocks group Nexus'
   const game = originalPair();
   game.bribePromises = [{event:'unreconciled-bribe', player:'d', asker:'a', turn:game.turn - 1,
     recipient:'c', minimum:1, answer:true, progress:0}];
-  assert.equal(viewGame(game, 'a').coalitionNexus, null);
+  assert.equal(viewGame(game, 'a').coalitionNexus?.admissionBlocked, true);
   const pair = coalitionOf(game.players, game.coalitionState, 'a')!;
   rejected(game, 'a', {type:'coalitionPropose', groupId:pair.id, entrant:'c',
     expectedRevision:game.coalitionState!.revision});
@@ -98,7 +98,7 @@ void test('a current unanswered group-incompatible Truthtrance commitment still
   const game = originalPair();
   game.bribePromises = [{event:'live-bribe', player:'d', asker:'a', turn:game.turn,
     recipient:'c', minimum:1, answer:true, progress:0}];
-  assert.equal(viewGame(game, 'a').coalitionNexus, null);
+  assert.equal(viewGame(game, 'a').coalitionNexus?.admissionBlocked, true);
   const pair = coalitionOf(game.players, game.coalitionState, 'a')!;
   rejected(game, 'a', {type:'coalitionPropose', groupId:pair.id, entrant:'c',
     expectedRevision:game.coalitionState!.revision});