Append an optional station log and announce the software after login.

A log path that cannot be written leaves the station on the reflector, and the reflector learns which program joined.

Co-authored-by: Cursor <cursoragent@cursor.com>

station/session_test.go

@@ -67,6 +67,12 @@ func TestLoginAnnouncesProtocolAndJoinsTheTalkGroup(t *testing.T) {
 	refl.writeFrame(t, 12, nil)
 	refl.writeFrame(t, 100, serverInfo(0x1234, []string{"db0abc"}, []string{"GSM", "OPUS"}))
 
+	typ, body = refl.readFrame(t)
+	if typ != 111 {
+		t.Fatalf("frame type %d, want software identity", typ)
+	}
+	requireSoftwareIdentity(t, body)
+
 	typ, body = refl.readFrame(t)
 	if typ != 106 {
 		t.Fatalf("frame type %d, want select talk group", typ)
@@ -89,7 +95,7 @@ func TestLoginAnnouncesProtocolAndJoinsTheTalkGroup(t *testing.T) {
 		t.Fatalf("State = %+v, want Connected Idle", got)
 	}
 
-	// No other talk group and no station profile: the next TCP message is a heartbeat, not type 107 or 111.
+	// No other talk group: the next TCP message is a heartbeat, not a monitor set.
 	clock.BlockUntilWaiting(t)
 	clock.Advance(10 * time.Second)
 	typ, _ = refl.readFrame(t)