dispatch: typed handlers, respond/defer/error, automatic ErrorResponse, watchdog

src/dispatcher.ts routes a directive to capability.on(name | "*"), device.onDirective() or
device.onReportState(), with the payload checked by the descriptor of the interface. The
DirectiveContext answers with respond/report/defer/error; respond() and report() start from
device.state(). A handler or 1.x listener that throws or rejects is answered with INTERNAL_ERROR
(an AlexaError with itself) and reported through "error", never as an unhandled rejection.
Undeclared interface, unknown directive, AdjustMode on an unordered mode and a missing handler
get INVALID_DIRECTIVE, a bad payload INVALID_VALUE; a device with an "Event" or "ReportState"
listener keeps the answer to itself. Every answer passes the dispatcher: the first one per
correlationToken is published, a second is refused. No answer within answerWithinMs (6500,
0 = off, unref'd timer) sends INTERNAL_ERROR and emits "unanswered". A messageId that arrived
in the last 60 s is dropped. New: "unknownEndpoint", options answerUnknownEndpoints, publisher,
timers, and bridge.receive() to run a bridge without a broker. 168 tests pass (18 new).

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

dist/cjs/device/Device.js

@@ -132,6 +132,32 @@ class Device extends events_1.EventEmitter {
         const build = () => (0, build_js_1.sceneEvent)({ endpointId: this.endpointId, correlationToken, activated, cause });
         return (0, transport_js_1.send)(this.publisher, answer(this.rootTopic, this.endpointId), build, this.onPublishError);
     }
+    /**
+     * How the device reports its state, every retrievable property of it:
+     *
+     *   blinds.state((s) => s.set(lift, "rangeValue", motor.position).health("OK"));
+     *
+     * ReportState is answered with it, and it is the context of every ctx.respond(), where the handler sets only what
+     * the directive changed. Alexa wants the whole state in both (alexa-response.html, "Synchronous response").
+     */
+    state(fill) {
+        this.stateProvider = fill;
+        return this;
+    }
+    /** Answer ReportState in a handler of its own, for a state that has to be read from the device first. */
+    onReportState(handler) {
+        this.reportStateHandler = handler;
+        return this;
+    }
+    /** The handler for the directives of declared capabilities that have no handler of their own. */
+    onDirective(handler) {
+        this.directiveHandler = handler;
+        return this;
+    }
+    /** The capability declared for the interface, under the instance for a generic controller. */
+    capability(namespace, instance = "") {
+        return this.capabilities.find((capability) => capability.namespace === namespace && capability.instance === instance);
+    }
     /** The capabilities the device declared, in the order it declared them. */
     getCapabilities() {
         return this.capabilities.slice();