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/Image.php

@@ -40,4 +40,20 @@ final readonly class Image
         public string $altText,
     ) {
     }
+
+    public function withFilename(string $filename): self
+    {
+        return new self(
+            ulid: $this->ulid,
+            filename: $filename,
+            originalFilename: $this->originalFilename,
+            mimeType: $this->mimeType,
+            fileSize: $this->fileSize,
+            width: $this->width,
+            height: $this->height,
+            hash: $this->hash,
+            path: $this->path,
+            altText: $this->altText
+        );
+    }
 }

src/Domain/Media/ImageRepository.php

@@ -40,6 +40,9 @@ final readonly class ImageRepository
         return $this->entityManager->findOneBy(Image::class, ['hash' => $hash]);
     }
 
+    /**
+     * @return Image[]
+     */
     public function findAll(int $limit = 50, int $offset = 0, ?string $search = null): array
     {
         // Simplified version - use EntityManager::findAll for now
@@ -91,11 +94,14 @@ final readonly class ImageRepository
         $image = $this->findByUlid($ulid);
 
         if ($image) {
-            $image->filename = $filename;
-            $this->entityManager->save($image);
+            $updatedImage = $image->withFilename($filename);
+            $this->entityManager->save($updatedImage);
         }
     }
 
+    /**
+     * @return Image[]
+     */
     public function search(string $query, ?string $type = null, int $minWidth = 0, int $minHeight = 0): array
     {
         $allImages = $this->entityManager->findAll(Image::class);

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);