feat(core): harden sessions settlement and credit activity

tests/Feature/PlayerRealtimeBroadcastTest.php

@@ -17,6 +17,7 @@ use App\Events\PlayCatalogUpdatedBroadcast;
 use Database\Seeders\LotterySettingsSeeder;
 use Illuminate\Broadcasting\PrivateChannel;
 use App\Services\Config\RiskCapStreamService;
+use App\Events\PlayerSessionReplacedBroadcast;
 use App\Services\Wallet\LotteryTransferService;
 use Illuminate\Foundation\Testing\RefreshDatabase;
 use App\Services\Wallet\WalletBalanceRealtimeNotifier;
@@ -39,6 +40,21 @@ test('balance update broadcasts only on the player private channel', function ()
         ->and($channels[0]->name)->toBe('private-player.42');
 });
 
+test('session replacement broadcasts the monotonic version on the player private channel', function (): void {
+    $event = new PlayerSessionReplacedBroadcast(42, 3, 1_234_567);
+    $channels = $event->broadcastOn();
+
+    expect($channels)->toHaveCount(1)
+        ->and($channels[0])->toBeInstanceOf(PrivateChannel::class)
+        ->and($channels[0]->name)->toBe('private-player.42')
+        ->and($event->broadcastAs())->toBe('session.replaced')
+        ->and($event->broadcastWith())->toBe([
+            'player_id' => 42,
+            'session_version' => 3,
+            'emitted_at_ms' => 1_234_567,
+        ]);
+});
+
 test('player private channel auth allows only the matching bearer player', function (): void {
     config([
         'broadcasting.default' => 'reverb',