feat(protocol): define strict first-slice wire contracts

cocoscreator_projects/framework-tests/protocol/first-slice-routes.test.ts

@@ -0,0 +1,31 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import {
+  FIRST_SLICE_RPC_ROUTE,
+  routeForFirstSlice,
+} from '../../YouleNexus/assets/framework/protocol/first-slice-routes.ts';
+
+test('FIRST_SLICE_RPC_ROUTE 是第一纵向切片唯一且精确的 rpc route 表', () => {
+  assert.deepEqual(FIRST_SLICE_RPC_ROUTE, {
+    player_login: 'agent',
+    self_join_room: 'agent',
+    player_prepare: 'room',
+    self_exit_room: 'room',
+    other_join_room: 'room',
+    other_exit_room: 'room',
+    other_offline: 'room',
+    other_online: 'room',
+    connect_roomserver: 'room',
+    connect_agentserver: 'agent',
+    kick_server: 'agent',
+  });
+});
+
+test('routeForFirstSlice 从单源映射取 route，未知 rpc 显式失败', () => {
+  assert.equal(routeForFirstSlice('self_join_room'), 'agent');
+  assert.equal(routeForFirstSlice('connect_roomserver'), 'room');
+  assert.throws(
+    () => routeForFirstSlice('unknown_rpc' as never),
+    /unknown_rpc/,
+  );
+});