fix(webauthn): counter zero only when stored is zero + CLI clears keys

- ZeroTolerantCounterChecker only tolerates a 0 counter when the stored counter is
  also 0; a 0 after a non-zero counter is a rollback and is rejected.
- clusev:reset-admin --disable-2fa now also deletes the user's security keys, so a
  compromised key can't revive when 2FA is re-enabled.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/Console/Commands/ResetAdmin.php

@@ -48,6 +48,9 @@ class ResetAdmin extends Command
                 'two_factor_confirmed_at' => null,
                 'two_factor_recovery_codes' => null,
             ]);
+            // Drop security keys too — a key that prompted the emergency reset must not
+            // silently revive when 2FA is re-enabled.
+            $user->webauthnCredentials()->delete();
         }
 
         $user->save();

app/Support/Webauthn/ZeroTolerantCounterChecker.php

@@ -16,8 +16,10 @@ class ZeroTolerantCounterChecker implements CounterChecker
 {
     public function check(CredentialRecord $credentialRecord, int $currentCounter): void
     {
-        if ($currentCounter === 0) {
-            return; // counter unsupported by this authenticator
+        // Tolerate 0 ONLY when the stored counter is also 0 (authenticator never counts).
+        // A 0 after a previously non-zero counter is a rollback/clone → reject.
+        if ($currentCounter === 0 && $credentialRecord->counter === 0) {
+            return;
         }
 
         if ($currentCounter <= $credentialRecord->counter) {

tests/Feature/ResetAdminCommandTest.php

@@ -3,6 +3,7 @@
 namespace Tests\Feature;
 
 use App\Models\User;
+use App\Models\WebauthnCredential;
 use Illuminate\Foundation\Testing\RefreshDatabase;
 use Illuminate\Support\Facades\Hash;
 use Tests\TestCase;
@@ -18,6 +19,7 @@ class ResetAdminCommandTest extends TestCase
             'two_factor_secret' => 'x', 'two_factor_confirmed_at' => now(),
         ]);
         $user->replaceRecoveryCodes();
+        WebauthnCredential::create(['user_id' => $user->id, 'name' => 'k', 'credential_id' => 'cid', 'public_key' => '{}', 'sign_count' => 0]);
 
         $this->artisan('clusev:reset-admin', ['--email' => 'admin@clusev.local', '--password' => 'BrandNew1234', '--disable-2fa' => true])
             ->assertExitCode(0);
@@ -27,6 +29,7 @@ class ResetAdminCommandTest extends TestCase
         $this->assertNull($user->two_factor_secret);
         $this->assertNull($user->two_factor_confirmed_at);
         $this->assertFalse($user->hasRecoveryCodes());
+        $this->assertFalse($user->hasWebauthnCredentials());
     }
 
     public function test_unknown_email_fails(): void