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/Framework/Validation/Exceptions/ValidationException.php

@@ -95,6 +95,16 @@ final class ValidationException extends FrameworkException
         return $this->validationResult->getFieldErrors($field);
     }
 
+    /**
+     * Gives all error messages as array (alias for getAllErrors)
+     *
+     * @return array<string, string[]> All error messages grouped by field
+     */
+    public function getErrors(): array
+    {
+        return $this->getAllErrors();
+    }
+
     /**
      * Gibt alle Fehlermeldungen als Array zurück
      *
@@ -123,6 +133,18 @@ final class ValidationException extends FrameworkException
         return ! empty($this->validationResult->getFieldErrors($field));
     }
 
+    /**
+     * Get the invalid value for the primary field
+     *
+     * @return mixed The invalid value that caused validation to fail
+     */
+    public function getInvalidValue(): mixed
+    {
+        // Return the field name as the "invalid value" since we don't store the original value
+        // In future implementations this could be enhanced to store the actual invalid value
+        return $this->field;
+    }
+
     /**
      * Bestimmt den passenden ErrorCode basierend auf den Validation Errors
      */