feat: announce poll lifecycle events to IRC and Kosmi

Handle poll.start, poll.ending, voting.ended, and poll.ending.cancelled
WebSocket messages from the upstream GamePicker API. Broadcasts opening,
closing-countdown, and closed announcements with per-bridge bold
formatting (IRC control codes vs asterisks for Kosmi).

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

gateway/router.go

@@ -119,7 +119,7 @@ func (r *Router) Start() error {
 	
 	// Start webhook server if Jackbox is enabled
 	if r.JackboxManager.IsEnabled() {
-		if err := r.JackboxManager.StartWebhookServer(r.broadcastJackboxMessage); err != nil {
+		if err := r.JackboxManager.StartWebhookServer(r.broadcastJackboxMessage, r.broadcastJackboxFormattedMessage); err != nil {
 			r.logger.Errorf("Failed to start Jackbox webhook server: %v", err)
 		}
 	}
@@ -274,3 +274,34 @@ func (r *Router) broadcastJackboxMessage(message string) {
 		}
 	}
 }
+
+// broadcastJackboxFormattedMessage broadcasts per-bridge formatted messages.
+// IRC bridges receive ircMsg (with IRC control codes), all others receive plainMsg.
+func (r *Router) broadcastJackboxFormattedMessage(ircMsg, plainMsg string) {
+	if r.JackboxManager != nil && r.JackboxManager.IsMuted() {
+		r.logger.Debugf("Jackbox formatted message suppressed (muted): %s", plainMsg)
+		return
+	}
+
+	r.logger.Infof("Broadcasting formatted Jackbox message: %s", plainMsg)
+
+	for _, gw := range r.Gateways {
+		for _, br := range gw.Bridges {
+			text := plainMsg
+			if br.Protocol == "irc" {
+				text = ircMsg
+			}
+
+			msg := config.Message{
+				Text:     " " + text,
+				Username: "Jackbox",
+				Account:  "jackbox",
+				Event:    config.EventUserAction,
+			}
+
+			if _, err := br.Send(msg); err != nil {
+				r.logger.Errorf("Failed to send formatted Jackbox message to %s: %v", br.Account, err)
+			}
+		}
+	}
+}