Fix PR linter findings for heartbeat routing changes

pkg/agent/loop.go

@@ -3603,7 +3603,7 @@ func (al *AgentLoop) handleHeartbeatCommand(args []string, msg bus.InboundMessag
 	}
 
 	arg := strings.ToLower(strings.TrimSpace(args[1]))
-	threadID := 0
+	var threadID int
 	var err error
 
 	switch arg {

pkg/agent/loop_test.go

@@ -1068,7 +1068,14 @@ func TestSplitChatAndThread(t *testing.T) {
 		t.Run(tt.name, func(t *testing.T) {
 			gotChatID, gotThread := splitChatAndThread(tt.chatID)
 			if gotChatID != tt.wantChatID || gotThread != tt.wantThread {
-				t.Fatalf("splitChatAndThread(%q) = (%q, %d), want (%q, %d)", tt.chatID, gotChatID, gotThread, tt.wantChatID, tt.wantThread)
+				t.Fatalf(
+					"splitChatAndThread(%q) = (%q, %d), want (%q, %d)",
+					tt.chatID,
+					gotChatID,
+					gotThread,
+					tt.wantChatID,
+					tt.wantThread,
+				)
 			}
 		})
 	}

pkg/heartbeat/service.go

@@ -273,7 +273,9 @@ func (hs *HeartbeatService) resolveTelegramThreadTarget(threadID int) (channel,
 		if ch != "telegram" || cid == "" {
 			continue
 		}
-		return ch, withTelegramThread(cid, threadID), fmt.Sprintf("telegram heartbeat_thread_id from %s", candidate.reason)
+		return ch,
+			withTelegramThread(cid, threadID),
+			fmt.Sprintf("telegram heartbeat_thread_id from %s", candidate.reason)
 	}
 
 	return "", "", ""