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
+        );
+    }
 }