Support group departures in joint commitment plans

tests/coalition-admission-joint-commitments.test.ts

@@ -43,24 +43,17 @@ function commitmentsLive(game: Game) {
   assert.equal(game.alliancePromises![0].released ?? false, false);
 }
 
-void test('joint accepted-order promises cannot be released by group proposal or approval', () => {
+void test('joint accepted-order promises remain binding after group admission', () => {
   let game = fixture();
-  const before = structuredClone(game);
-  assert.throws(() => act(game, 'a', proposal(game)));
-  assert.deepEqual(game, before);
+  game = act(game, 'a', proposal(game));
   commitmentsLive(game);
-
-  // Another member may propose; the affected player can still decline, but
-  // cannot approve a group while the scalar reconciliation is unsupported.
-  game = act(game, 'b', proposal(game));
+  game = act(game, 'b', answer(game, true));
   commitmentsLive(game);
   game = act(game, 'c', answer(game, true));
   commitmentsLive(game);
-  const pending = structuredClone(game);
-  assert.throws(() => act(game, 'a', answer(game, true)));
-  assert.deepEqual(game, pending);
-  commitmentsLive(game);
-  game = act(game, 'a', answer(game, false));
-  commitmentsLive(game);
   assert.equal(game.coalitionState!.proposal, null);
+  assert.deepEqual(coalitionOf(game.players, game.coalitionState, 'a')!.members, ['a','b','c']);
+  game = act(game, 'a', {type:'bribe', target:'e', amount:1});
+  assert.equal(game.bribePromises![0].fulfilled, true);
+  assert.equal(game.alliancePromises![0].released ?? false, false);
 });