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/esm/transport.d.ts

@@ -12,6 +12,8 @@ export type PublishResult = {
 export interface Publisher {
     publish(topic: string, message: object): Promise<PublishResult>;
 }
+/** What was thrown, as an Error. */
+export declare const asError: (err: unknown) => Error;
 /**
  * Publishes to the broker through the client the bridge has at the time: a new one after disconnect() and connect(),
  * none before connect() and after disconnect(). Without a client the publish is refused. With a client that lost
@@ -26,7 +28,7 @@ export declare class MqttPublisher implements Publisher {
  * Keeps what it is asked to publish, for tests and dry runs without a broker:
  *
  *   const sent = new MemoryPublisher();
- *   device.publisher = sent;
+ *   device.publisher = sent;                     // or new Alex2MQTT(..., { publisher: sent }) and bridge.receive()
  *   await device.getStatusMessage(token, true).addPowerControllerProp(PowerController.ON).send();
  *   sent.published[0]   // { topic: "<root>/<endpointId>/alexaResponce", message: { event, context } }
  */