IRC: add the firmware version to the CTCP VERSION reply

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0162FokPdvY2KsS4NBfwyWPk

lib/irc/src/irc_session.cpp

@@ -4,6 +4,7 @@
 #include <cctype>
 
 #include "base64.h"
+#include "version.h"
 
 namespace roro {
 
@@ -284,7 +285,7 @@ void IrcSession::onPrivmsg(const IrcMessage& m, int64_t utc, bool notice) {
             action = true;
             text = rest;
         } else {
-            if (verb == "VERSION" && !notice) send(std::string("NOTICE ") + from + " :" + kCtcp + "VERSION roro9stack" + kCtcp);
+            if (verb == "VERSION" && !notice) send(std::string("NOTICE ") + from + " :" + kCtcp + "VERSION " + kProductName + " " + versionString() + kCtcp);
             return;
         }
     }