fix: resolve RedisCache array offset error and improve discovery diagnostics

- Fix RedisCache driver to handle MGET failures gracefully with fallback
- Add comprehensive discovery context comparison debug tools
- Identify root cause: WEB context discovery missing 166 items vs CLI
- WEB context missing RequestFactory class entirely (52 vs 69 commands)
- Improved exception handling with detailed binding diagnostics

src/Domain/Media/ImageSlotRepository.php

@@ -33,6 +33,9 @@ final readonly class ImageSlotRepository
         return $this->entityManager->save($imageSlot);
     }
 
+    /**
+     * @return array<int, ImageSlotView>
+     */
     public function findAllWithImages(): array
     {
         $slots = $this->entityManager->findAll(ImageSlot::class);