Answer every segment of an inbound concatenated message as it arrives (#83)

* Regression tests for answering every inbound segment as it arrives

* Answer every segment of an inbound concatenated message as it arrives

* Record the segment-by-segment answer in AGENTS.md and README

* Regression tests for an empty message_id on deliver_sm_resp

* Answer a deliver_sm with the empty message_id SMPP 3.4 makes it

* Record Jasmin's refusal of a deliver_sm_resp message_id

* Mark the Jasmin multipart deadlock fixed

* Regression tests for the architecture review's findings

* Give the segment id notation an owner, and every segment a status

* Correct what the ids reach and what a lost group tells the application

* Regression tests for a group lost to its own octet overrun

* Report a group lost to its own overrun, and refuse by the command it arrived on

* Keep the docs true about what a segment is answered with

* Count only the answered segments of a group lost to an overrun

* Report only what a lost group cost, and say which cap bit

src/session.ts

@@ -359,12 +359,16 @@ export class Session extends EventEmitter<SessionEvents> {
 		if (this.closed) return;
 
 		this.closed = true;
-		this.outgoing.linkLost(this.retrying());
+
+		// Read once: clear() reports lost segments, and a listener could stop the loop between reads.
+		const retrying = this.retrying();
+
+		this.outgoing.linkLost(retrying);
 		this.timers.clear();
 		this.incoming.clear();
 		this.sock.destroy();
 
-		if (this.retrying()) this.emit('disconnected');
+		if (retrying) this.emit('disconnected');
 		else this.emitClose();
 	}