messages: pure builders for every event the bridge sends

src/messages builds Response, StateReport, DeferredResponse, ErrorResponse, ChangeReport and the scene, doorbell
and simple events from plain values; messageId and times are parameters, so a test compares whole objects.
StateBuilder collects properties checked by the descriptors, AlexaError and AlexaErrors carry the payload fields
of an error type. AlexaStatusMessage and AlexaErrorResponse move to src/compat and are written on the builders.
On the wire, against 1.5.2: a DeferredResponse has no context key, a ChangeReport has no correlationToken, the
namespace of an ErrorResponse follows its type, and a ChangeReport without a changed property is not published:
send() resolves "" and the bridge reports an error that names the endpoint.
143 tests pass (108 before).

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

dist/cjs/compat/AlexaErrorResponse.js

@@ -0,0 +1,54 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.AlexaErrorResponse = void 0;
+const crypto_1 = require("crypto");
+const build_js_1 = require("../messages/build.js");
+const errors_js_1 = require("../messages/errors.js");
+/** An ErrorResponse as 1.x builds it: device.getErrorMessage(token), setErrorMessage(), send(). */
+class AlexaErrorResponse {
+    constructor(correlationToken, rootTopic, endpointId, mqttClient) {
+        this.correlationToken = correlationToken;
+        this.rootTopic = rootTopic;
+        this.endpointId = endpointId;
+        this.mqttClient = mqttClient;
+        // Sent when setErrorMessage() was not called: 1.x published an empty payload, which is no ErrorResponse to Alexa
+        this.error = errors_js_1.AlexaErrors.of("INTERNAL_ERROR", "the device answered with an error and did not say which");
+        // One id for the message, however often toJSON() is called
+        this.messageId = (0, crypto_1.randomUUID)();
+    }
+    /**
+     * The error to answer with. otherParams are the fields the type adds to the payload (validRange). The header
+     * carries the namespace the type is documented under, Alexa.ThermostatController for THERMOSTAT_IS_OFF;
+     * options.namespace names another.
+     */
+    setErrorMessage(type, message, otherParams = {}, options = {}) {
+        this.error = errors_js_1.AlexaErrors.of(type, message, otherParams);
+        this.namespace = options.namespace;
+    }
+    toJSON() {
+        const { type, alexaMessage, extra } = this.error;
+        return (0, build_js_1.errorResponse)({
+            endpointId: this.endpointId,
+            messageId: this.messageId,
+            correlationToken: this.correlationToken,
+            type,
+            message: alexaMessage,
+            extra,
+            namespace: this.namespace ?? this.error.namespace,
+        });
+    }
+    /** Resolves with the topic published to, or "" when the publish failed. Never rejects. */
+    send(sendAsync = false) {
+        const topic = `${this.rootTopic}/${this.endpointId}/${sendAsync ? "deferredResponse" : "alexaResponce"}`; // "alexaResponce" is how Alex2MQTT and Alex2ESP spell the topic
+        return new Promise((resolve) => {
+            this.mqttClient.publish(topic, JSON.stringify(this.toJSON()), (err) => {
+                if (!err)
+                    return resolve(topic);
+                if (this.onPublishError)
+                    this.onPublishError(err); // -> the bridge's "error" event (when somebody listens)
+                resolve(""); // 1.5.1 rejected here, and an un-caught send() then killed the host on any broker hiccup
+            });
+        });
+    }
+}
+exports.AlexaErrorResponse = AlexaErrorResponse;