Add architecture tests and code fixes

tests/Unit/ArchTest.php

@@ -2,6 +2,79 @@
 
 declare(strict_types=1);
 
+use Illuminate\Database\Eloquent\Factories\Factory;
+
 arch()->preset()->php();
 arch()->preset()->laravel();
 arch()->preset()->security();
+
+arch('controllers')
+    ->expect('App\Http\Controllers')
+    ->not->toBeUsed();
+
+arch('avoid mutation')
+    ->expect('App')
+    ->classes()
+    ->toBeReadonly()
+    ->ignoring([
+        'App\Exceptions',
+        'App\Jobs',
+        'App\Livewire',
+        'App\Models',
+        'App\Providers',
+        'App\Services',
+    ]);
+
+arch('avoid inheritance')
+    ->expect('App')
+    ->classes()
+    ->toExtendNothing()
+    ->ignoring([
+        'App\Exceptions',
+        'App\Jobs',
+        'App\Livewire',
+        'App\Models',
+        'App\Providers',
+        'App\Services',
+    ]);
+
+arch('avoid open for extension')
+    ->expect('App')
+    ->classes()
+    ->toBeFinal()
+    ->ignoring([
+        'App\Livewire',
+    ]);
+
+arch('avoid abstraction')
+    ->expect('App')
+    ->not->toBeAbstract();
+
+arch('factories')
+    ->expect('Database\Factories')
+    ->toExtend(Factory::class)
+    ->toHaveMethod('definition')
+    ->toOnlyBeUsedIn([
+        'App\Models',
+    ]);
+
+arch('models')
+    ->expect('App\Models')
+    ->toHaveMethod('casts')
+    ->toOnlyBeUsedIn([
+        'App\Actions',
+        'App\Http',
+        'App\Jobs',
+        'App\Livewire',
+        'App\Models',
+        'App\Observers',
+        'App\Policies',
+        'App\Providers',
+        'App\Services',
+        'Database\Factories',
+        'Database\Seeders',
+    ]);
+
+arch('actions')
+    ->expect('App\Actions')
+    ->toHaveMethod('handle');