Add character emotes across bot friend and ranked matches

tests/emotes.test.ts

@@ -0,0 +1,18 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { createEmotes } from '../src/shared/emotes.js';
+import { EMOTE_COOLDOWN_MS, EMOTE_DURATION_MS } from '../constants/emotes.js';
+
+test('emotes validate fixed choices, rate limit each player and expire without changing battle state', () => {
+  const emotes = createEmotes();
+  assert.equal(emotes.send(0, '<script>', 1000), false);
+  assert.equal(emotes.send(0, 'greet', 1000), true);
+  assert.equal(emotes.send(0, 'taunt', 1001), false);
+  assert.equal(emotes.send(1, 'thanks', 1001), true);
+  assert.equal(emotes.view(1001)[0]?.id, 'greet');
+  const snapshot = emotes.view(1001);
+  snapshot[0]!.id = 'threaten';
+  assert.equal(emotes.view(1001)[0]?.id, 'greet');
+  assert.equal(emotes.view(1000 + EMOTE_DURATION_MS)[0], null);
+  assert.equal(emotes.send(0, 'taunt', 1000 + EMOTE_COOLDOWN_MS), true);
+});