feat: actualizar last_command_at al detectar cualquier /t

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

src/services/command.ts

@@ -1373,6 +1373,16 @@ Nota: nunca respondo en grupos; solo por privado.`;
 			return { responses: [], ok: true };
 		}
 
+		// Registrar interacción del usuario (last_command_at) para cualquier comando /t …
+		try {
+			const ensured = ensureUserExists(context.sender, this.dbInstance);
+			if (ensured) {
+				try {
+					this.dbInstance.prepare(`UPDATE users SET last_command_at = strftime('%Y-%m-%d %H:%M:%f','now') WHERE id = ?`).run(ensured);
+				} catch {}
+			}
+		} catch {}
+
 		// Gating de grupos en modo 'enforce' (cuando CommandService se invoca directamente)
 		if (isGroupId(context.groupId)) {
 			try { (AllowedGroups as any).dbInstance = this.dbInstance; } catch { }

tests/unit/db.test.ts

@@ -71,7 +71,7 @@ describe('Database', () => {
         .query("PRAGMA table_info(users)")
         .all()
         .map((c: any) => c.name);
-      expect(columns).toEqual(['id', 'first_seen', 'last_seen']);
+      expect(columns).toEqual(['id', 'first_seen', 'last_seen', 'last_command_at']);
     });
 
     test('tasks table should have required columns', () => {