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/expiring-groups.ts

@@ -58,9 +58,18 @@ export class ExpiringGroups<T> {
 		this.idle();
 	}
 
-	clear(): void {
+	/** Removes every group and hands them over, so an owner that must account for them can. */
+	takeAll(): [string, T][] {
+		const taken: [string, T][] = [];
+
+		for (const [key, entry] of this.entries) {
+			taken.push([key, entry.group]);
+		}
+
 		this.entries.clear();
 		this.idle();
+
+		return taken;
 	}
 
 	/** Removes every group past its deadline and hands them over. */