docs: the shutdown comments say what happens, without the task number

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

cmd/minstrel/main.go

@@ -484,7 +484,7 @@ func run() error {
 	// Shutdown waits for in-flight requests but never cancels them, and an
 	// SSE stream only ends when its client leaves. Closing the bus ends
 	// every stream as shutdown begins, so the drain waits only on real work
-	// such as an audio stream; clients reconnect to the next instance (#5293).
+	// such as an audio stream; clients reconnect to the next instance.
 	httpServer.RegisterOnShutdown(bus.Close)
 
 	errCh := make(chan error, 1)

internal/eventbus/eventbus_test.go

@@ -150,7 +150,7 @@ func TestPublish_ConcurrentWritersAndSubscribers(t *testing.T) {
 }
 
 // Close is what lets the server shut down with SSE clients connected: each
-// stream returns when its channel closes (#5293).
+// stream returns when its channel closes.
 func TestClose_EndsEverySubscription(t *testing.T) {
 	t.Parallel()
 	b := New()