Reword two confusing mainframe hints

- DecodeMessage::PLAYER_3 ("locked up bash files should be removed to
  lock it up") was awkward and unclear about what it meant.
- The private-communication hint said "contact each other privately",
  which read as any one private message rather than the actual
  requirement of messaging every other agent privately.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/Command/SendMainframeHintsCommand.php

@@ -132,7 +132,7 @@ final class SendMainframeHintsCommand extends Command
 
         if (!$hasBroadcast || !$hasContactedEveryonePrivately) {
             if ($elapsed >= self::PRIVATE_CHAT_THRESHOLD_SECONDS) {
-                $this->publishHint($session, 'The AI virus can see all communication if you are using open communication channels. Contact each other privately as well.', $player);
+                $this->publishHint($session, 'The AI virus can see all communication if you are using open communication channels. Make sure you send private messages to all other agents as well, so I know you can.', $player);
                 return true;
             }
             if (!$hasBroadcast && $elapsed >= self::BROADCAST_CHAT_THRESHOLD_SECONDS) {

src/Game/Enum/DecodeMessage.php

@@ -6,5 +6,5 @@ enum DecodeMessage: string
 {
     case PLAYER_1 = 'Sudo is now available';
     case PLAYER_2 = 'AI virus protects its own files by replacing them';
-    case PLAYER_3 = 'The locked up bash files should be removed to lock it up';
+    case PLAYER_3 = 'The AI virus is having a lock on certain files. Remove these to disable it.';
 }