Randomize decoy usernames and which rapports carry coded messages

Decoy names in /var/home and verifyCodes.txt were a hardcoded 4-name
list (Luke, Charles, William, Peter), so a real player registering
under one of those names would collide with it. Now each session
picks 6 decoys from a pool of 10, excluding any name already taken by
a real player, and stores the pick as a session setting.

Likewise the 3 "special report" rapports that get coded messages were
always Doyle, Vega and Lennox. Each session now randomly assigns 3 of
the 20 rapports to that role, and the win screen / mainframe-help
message reference whichever agents were actually picked instead of
the hardcoded names.

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

src/Game/Controller/GameController.php

@@ -282,7 +282,8 @@ final class GameController extends AbstractController
         Session $session,
         Request $request,
         Security $security,
-        PlayerRepository $playerRepository
+        PlayerRepository $playerRepository,
+        GameResponseService $gameResponseService
     ): Response {
         /** @var User $user */
         $user = $security->getUser();
@@ -304,6 +305,7 @@ final class GameController extends AbstractController
 
         return $this->render('game/won.html.twig', [
             'session' => $session,
+            'agentsText' => $gameResponseService->getSpecialReportAgentsText($session),
         ]);
     }