feat: Implement IdleState class for turtle state machine to handle idle behavior

server/states/IdleState.js

@@ -0,0 +1,24 @@
+/**
+ * IdleState - Turtle is idle, waiting for commands
+ */
+import { BaseState } from './BaseState.js';
+
+export class IdleState extends BaseState {
+  get name() {
+    return 'idle';
+  }
+
+  get description() {
+    return 'Idle - waiting for commands';
+  }
+
+  async *act() {
+    // Send periodic status updates while idle
+    while (!this.cancelled) {
+      await this.checkFuel();
+      await this.scanSurroundings();
+      yield;
+      await this._sleep(5000);
+    }
+  }
+}