examples: one runnable file per recipe on the 2.0 API, the 1.x files in examples/legacy

Ten recipes: lamp, colour lamp, thermostat, blind, lock (deferred), contact
sensor (ChangeReport), scene, doorbell (raise), typed errors, and a plug as an
ES module. Each reads ALEX2MQTT_USERNAME, _PASSWORD and _ROOT_TOPIC and names
the ones that are missing. The nine examples of 1.5.2 move to examples/legacy
unchanged.

test/examples.test.js starts every file with node, its broker connection sent
to a broker on 127.0.0.1 (test/helpers/loopback.js), discovers the device,
sends directives and checks the answers. A legacy file is started and its
discovery compared with the answer the 1.5.2 build gave, recorded in
test/fixtures/legacy-examples.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

examples/legacy/ExampleToggleController.js

@@ -0,0 +1,80 @@
+// Import the library ("alex2node" is the installed package; inside this checkout it resolves to the built dist/ via package.json "exports")
+const {
+    Alex2MQTT,
+    AlexaInterfaceType,
+    PowerController,
+    EndpointHealth,
+  } = require("alex2node");
+
+  require("dotenv").config();
+
+  const username = process.env.MQTT_USERNAME;
+  const password = process.env.MQTT_PASSWORD;
+  const rootTopic = process.env.MQTT_ROOT_TOPIC;
+
+  const alex2NodeClient = new Alex2MQTT(username, password, rootTopic, false); // set the 4th argument to true to print every MQTT payload
+  alex2NodeClient.connect();
+  alex2NodeClient.on("error", (e) => console.error("broker:", e.message)); // Log broker errors (on 1.5.0 this listener is also what keeps an outage from killing the process)
+
+  const deviceName = "Custom Device";
+  const customToggle = alex2NodeClient.registerDevice(deviceName, "custom-device-1");
+  
+  // Define 8 toggle instances and friendly names
+  const switchCount = 8;
+  const instanceNames = Array.from({ length: switchCount }, (_, i) => `nodejs.toggle.switch${i + 1}`);
+  const friendlyNames = Array.from({ length: switchCount }, (_, i) => `Switch ${i + 1}`);
+  
+  // Add toggle capabilities and store toggle objects
+  const toggles = [];
+  for (let i = 0; i < switchCount; i++) {
+    const toggle = customToggle.addCapability(AlexaInterfaceType.TOGGLE_CONTROLLER);
+    toggle.setInstance(instanceNames[i]);
+    toggle.addFriendlyName(friendlyNames[i], "en-US");
+    toggles.push(toggle);
+  }
+  
+  // Output states for all switches
+  const toggleStates = Array(switchCount).fill(PowerController.OFF);
+  
+  console.log(customToggle.getName());
+  
+  customToggle.on("ReportState", (payload) => {
+    console.log("ReportState received!", payload);
+    const { correlationToken } = payload.header;
+    const status = customToggle.getStatusMessage(correlationToken);
+  
+    status.addHealthProp(EndpointHealth.OK);
+  
+    // Report all toggle states
+    for (let i = 0; i < switchCount; i++) {
+      status.addToggleControllerProp(toggleStates[i], instanceNames[i]);
+    }
+  
+    status.send();
+  });
+  
+  customToggle.on("Event", (directive, interfaceType) => {
+    console.log("Event received", { directive, interfaceType });
+  
+    if (interfaceType === AlexaInterfaceType.TOGGLE_CONTROLLER) {
+      const { name, correlationToken, instance } = directive.header;
+  
+      const index = instanceNames.indexOf(instance);
+      if (index !== -1) {
+        if (name === "TurnOn") {
+          toggleStates[index] = PowerController.ON;
+          console.log(`Turning ON ${friendlyNames[index]}`);
+        } else if (name === "TurnOff") {
+          toggleStates[index] = PowerController.OFF;
+          console.log(`Turning OFF ${friendlyNames[index]}`);
+        }
+  
+        const status = customToggle.getStatusMessage(correlationToken, true);
+        status
+          .addHealthProp(EndpointHealth.OK)
+          .addToggleControllerProp(toggleStates[index], instance)
+          .send();
+      }
+    }
+  });
+