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/ErrorHandling/ErrorHandler.php

@@ -215,6 +215,9 @@ final readonly class ErrorHandler
         return RequestContext::fromGlobals();
     }
 
+    /**
+     * @return array<string, mixed>
+     */
     private function createExceptionMetadata(Throwable $exception): array
     {
         $metadata = [
@@ -311,6 +314,7 @@ final readonly class ErrorHandler
             }
         } catch (Throwable $e) {
             // Sicherer Fallback für Production
+            return false;
         }
 
         return false;