Name the worker a piece of work came from, so a bundle taking two is handed each to its own handler

node-tools/internal/bus/seat.go

@@ -195,6 +195,7 @@ func (c *Conn) SeatAnswer(module, subject string, answer func(subject string, bo
 
 // Work is one message a holder took from a seat's work queue.
 type Work struct {
+	Worker  string            `json:"worker"`
 	Subject string            `json:"subject"`
 	Body    json.RawMessage   `json:"body"`
 	Headers map[string]string `json:"headers,omitempty"`
@@ -241,7 +242,7 @@ func (c *Conn) SeatTake(module, consumer string, deliver func(Work) error) (func
 		for k := range msg.Headers() {
 			headers[k] = msg.Headers().Get(k)
 		}
-		if err := deliver(Work{Subject: msg.Subject(), Body: json.RawMessage(msg.Data()), Headers: headers}); err != nil {
+		if err := deliver(Work{Worker: w.Consumer, Subject: msg.Subject(), Body: json.RawMessage(msg.Data()), Headers: headers}); err != nil {
 			_ = msg.NakWithDelay(NakDelay)
 			return
 		}