Enable Discovery debug logging for production troubleshooting

- Add DISCOVERY_LOG_LEVEL=debug
- Add DISCOVERY_SHOW_PROGRESS=true
- Temporary changes for debugging InitializerProcessor fixes on production

src/Framework/DI/InstanceRegistry.php

@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace App\Framework\DI;
 
 /**
@@ -8,43 +10,62 @@ namespace App\Framework\DI;
 final class InstanceRegistry
 {
     private array $singletons = [];
+
     private array $instances = [];
 
+    /**
+     * @template T of object
+     * @param class-string<T> $class
+     * @return T|null
+     */
     public function getSingleton(string $class): ?object
     {
         return $this->singletons[$class] ?? null;
     }
 
+    /** @param class-string $class */
     public function hasSingleton(string $class): bool
     {
         return isset($this->singletons[$class]) && $this->singletons[$class] !== null;
     }
 
+    /** @param class-string $class */
     public function setSingleton(string $class, object $instance): void
     {
         $this->singletons[$class] = $instance;
     }
 
+    /** @param class-string $class */
     public function markAsSingleton(string $class): void
     {
         $this->singletons[$class] = null;
     }
 
+    /** @param class-string $class */
+    public function isMarkedAsSingleton(string $class): bool
+    {
+        return array_key_exists($class, $this->singletons);
+    }
+
+    /** @param class-string $class */
     public function getInstance(string $class): ?object
     {
         return $this->instances[$class] ?? null;
     }
 
+    /** @param class-string $class */
     public function hasInstance(string $class): bool
     {
         return isset($this->instances[$class]);
     }
 
+    /** @param class-string $class */
     public function setInstance(string $class, object $instance): void
     {
         $this->instances[$class] = $instance;
     }
 
+    /** @param class-string $class */
     public function forget(string $class): void
     {
         unset($this->instances[$class], $this->singletons[$class]);
@@ -63,4 +84,9 @@ final class InstanceRegistry
             array_keys($this->instances)
         );
     }
+
+    public function getSingletons(): array
+    {
+        return array_keys($this->singletons);
+    }
 }