fix(platform): serialize runtime session transitions

cocoscreator_projects/framework-tests/protocol/contracts.test.ts

@@ -15,6 +15,7 @@ import {
   parseOtherOfflinePayload,
   parseOtherOnlinePayload,
   parsePlayerPreparePayload,
+  parseSelfExitRoomPayload,
   parseSelfJoinRoomResponse,
 } from '../../YouleNexus/assets/framework/protocol/contracts/index.ts';
 
@@ -214,6 +215,38 @@ test('parseSelfJoinRoomResponse 接受金样，不深验 roomtype/deskinfo 并
   assert.equal(parsed.reconnect.present && parsed.reconnect.value, opaqueDeskinfo);
 });
 
+test('parseSelfJoinRoomResponse defines the optional deskwar default once and deskinfo wins stage', () => {
+  const cases = [
+    { deskwar: 'missing', deskinfo: false, expectedStage: 0 },
+    { deskwar: 0, deskinfo: false, expectedStage: 0 },
+    { deskwar: 1, deskinfo: false, expectedStage: 1 },
+    { deskwar: 'missing', deskinfo: true, expectedStage: 1 },
+    { deskwar: 0, deskinfo: true, expectedStage: 1 },
+    { deskwar: 1, deskinfo: true, expectedStage: 1 },
+  ] as const;
+
+  for (const row of cases) {
+    const data = fixture('self-join-room.json').data;
+    if (row.deskwar === 'missing') delete data.deskwar;
+    else data.deskwar = row.deskwar;
+    if (row.deskinfo) data.deskinfo = { round: 7 };
+    else delete data.deskinfo;
+    data.isbattle = 1;
+
+    const parsed = parseSelfJoinRoomResponse(data);
+
+    assert.equal(parsed.stage, row.expectedStage, JSON.stringify(row));
+    assert.equal(parsed.reconnect.present, row.deskinfo, JSON.stringify(row));
+  }
+
+  for (const deskwar of [-1, 2, 1.5, '1', undefined]) {
+    assert.throws(
+      () => parseSelfJoinRoomResponse({ ...fixture('self-join-room.json').data, deskwar }),
+      /\$\.data\.deskwar/,
+    );
+  }
+});
+
 test('房间请求 builder 使用唯一 route，并仅发协议定义字段', () => {
   const room = { playerid: 430511, roomcode: '100001' };
   assert.deepEqual(buildPrepareRequest(runtimeConfig, room), {
@@ -311,6 +344,23 @@ test('座位事件 parser 校验实际消费字段并保留 raw', () => {
   assert.throws(() => parseOtherOnlinePayload({ seat: 1 }), /\$\.data\.ip.*undefined/);
 });
 
+test('self_exit_room parser accepts an omitted seat but strictly validates it when present', () => {
+  const withoutSeat = { isowner: 1, roomcode: '100001', extension: 'kept' };
+  const parsedWithoutSeat = parseSelfExitRoomPayload(withoutSeat);
+  assert.equal(parsedWithoutSeat.raw, withoutSeat);
+  assert.equal(Object.prototype.hasOwnProperty.call(parsedWithoutSeat, 'seat'), false);
+
+  const withSeat = { seat: 1, extension: 'kept' };
+  const parsedWithSeat = parseSelfExitRoomPayload(withSeat);
+  assert.equal(parsedWithSeat.raw, withSeat);
+  assert.equal(parsedWithSeat.seat, 1);
+
+  for (const seat of [-1, 1.2, '1', undefined]) {
+    assert.throws(() => parseSelfExitRoomPayload({ seat }), /\$\.data\.seat/);
+  }
+  assert.throws(() => parseOtherExitRoomPayload({}), /\$\.data\.seat/);
+});
+
 test('切服与踢出 parser 拒绝畸形载荷并保留未知扩展', () => {
   const roomSwitch = { roomserver: '127.0.0.1:9001', epoch: 7 };
   assert.deepEqual(parseConnectRoomserverPayload(roomSwitch), {