Give server() consumers the onRequest hook the docs promise (#86)

* Regression tests for an onRequest hook on server()

* Compose the application's onRequest hook into server() past bind

* Document the server's onRequest hook and record the composition decision

* Pin that a re-bind and a pre-bind unbind never reach the hook, and that a non-function hook is refused at startup

* Keep every bind and all pre-bind traffic out of the application's hook

* Make the hook's published promises exact, and record the src layout deferral

* Trim the record to what the tests do not already forbid

* Pin that nothing answers a request whose hook failed

* Answer nothing for a request whose hook failed, on both surfaces alike

* State the hook's failure policy as it now behaves

* Name the request a failed handler left unanswered, and say what a wedged hook reports

src/session.ts

@@ -397,7 +397,11 @@ export class Session extends EventEmitter<SessionEvents> {
 		void this.incoming.handle(pduObj).catch((thrown: unknown) => {
 			const err = errorFrom(thrown);
 
-			this.log.error('session - a handler threw', { message: err.message });
+			this.log.error('session - a handler threw', {
+				cmdName: pduObj.cmdName,
+				message: err.message,
+				seqNr: pduObj.seqNr,
+			});
 			this.emit('sessionError', err);
 		});
 	}