test: inicializar DB en memoria para pruebas de CommandService

Co-authored-by: aider (openrouter/openai/gpt-5) <aider@aider.chat>

tests/unit/services/command.unknown-help.test.ts

@@ -1,7 +1,23 @@
-import { describe, it, expect } from 'bun:test';
+import { describe, it, expect, beforeEach, afterEach } from 'bun:test';
+import { Database } from 'bun:sqlite';
+import { initializeDatabase } from '../../../src/db';
 import { CommandService } from '../../../src/services/command';
+import { setDb, resetDb } from '../../../src/db/locator';
 
 describe('CommandService - comando desconocido devuelve ayuda rápida', () => {
+  let memdb: Database;
+
+  beforeEach(() => {
+    process.env.NODE_ENV = 'test';
+    memdb = new Database(':memory:');
+    initializeDatabase(memdb);
+    setDb(memdb);
+  });
+
+  afterEach(() => {
+    try { resetDb(); memdb.close(); } catch {}
+  });
+
   it('responde con encabezado y CTA a /t ayuda incluyendo quick help', async () => {
     const res = await CommandService.handle({
       sender: '600000001',