Prepare game updates and single-process PM2 deployment

tests/match-introduction.test.ts

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+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { DEFAULT_GLOBAL_SETTINGS } from '../constants/global-settings.js';
+import { createMatchEngine } from '../src/shared/match-engine.js';
+import { matchIntroductionDuration, matchIntroductionMessage } from '../src/shared/match-introduction.js';
+
+for (const ranked of [false, true]) test(`configurable introduction preserves preparation and first turn (ranked: ${ranked})`, () => {
+  let now = 0;
+  const settings = { ...DEFAULT_GLOBAL_SETTINGS, matchingDelayMs: 4000, matchSuccessDelayMs: 2000, matchPreparationDelayMs: 5000 };
+  const engine = createMatchEngine({ matchId: 'intro', mode: 'friend', selfIndex: 0, clock: { now: () => now }, settings });
+  engine.start(matchIntroductionDuration(settings, ranked));
+  const message = () => matchIntroductionMessage({ ...engine.view(), ranked }, now);
+  assert.equal(message(), ranked ? '랭킹대전 매칭 중…' : '친구 대전 매칭 성공!');
+  if (ranked) { now = 4000; assert.equal(message(), '랭킹대전 매칭 성공!'); }
+  now += 2000;
+  assert.equal(message(), ranked ? '랭킹대전 준비 중…' : '친구 대전 준비 중…');
+  assert.equal(engine.beginTurn(), false);
+  now += 5000;
+  assert.equal(engine.beginTurn(), true);
+  assert.equal(message(), undefined);
+  assert.equal(engine.view().deadline - now, settings.turnDurationMs);
+});