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/held-messages.ts

@@ -76,7 +76,7 @@ export class HeldMessages {
 
 	/** Drops every message: their segments went with the link, so no answer of ours correlates now. */
 	clear(): void {
-		this.held.clear();
+		this.held.takeAll();
 		this.idleWaiters.settle();
 	}