Drop the line count that drifts and reuse the delay helper

src/session.ts

@@ -273,7 +273,7 @@ export class Session extends EventEmitter<SessionEvents> {
 			return { err: bound.err };
 		}
 
-		// close() can land while the rebind is in flight, and it has nothing left to tear down.
+		// close() can land while the rebind is in flight.
 		if (this.reconnectLoop?.isStopped() === true) {
 			this.teardown();
 

test/session-extras.test.ts

@@ -419,7 +419,7 @@ describe('reconnect', () => {
 		session.on('reconnected', () => { reconnects++; });
 		await session.close();
 
-		await new Promise(resolve => setTimeout(resolve, 150));
+		await delay(150);
 
 		assert.equal(reconnects, 0);
 		await smpp.close();

todo.md

@@ -124,9 +124,9 @@ session message is a change to every call site.
       loses every incomplete group, and a peer has no reason to resend a receipt it already had
       answered. Surviving one means exposing the merge state for the application to persist and hand
       back, which is a public-surface decision.
-- [ ] **`session.ts` is 468 lines.** The one seam left in it is a socket-to-PDU transport, which
+- [ ] **`session.ts` has one seam left in it**, a socket-to-PDU transport, which would move the
-      would move the deliberately public `sock` field out of `Session` or turn it into a getter —
+      deliberately public `sock` field out of `Session` or turn it into a getter — a public-surface
-      a public-surface change, so it waits for a decision.
+      change, so it waits for a decision.
 - [ ] **Group the session's collaborators under `src/session/`.** Only `session.ts` imports
       `reassembly`, `dlr-merger`, `send-window`, `link-timers`, `reconnect-loop`, `pending-requests`
       and `send-sms`, so the directory would make that boundary visible. Do it on the next