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/Application/Http/BatchController.php

@@ -32,7 +32,7 @@ final readonly class BatchController
     {
         try {
             // Validate content type
-            $contentType = $request->headers->getFirst('Content-Type', '');
+            $contentType = $request->headers->getFirst('Content-Type') ?? '';
             if (! str_contains($contentType, 'application/json')) {
                 return $this->errorResponse(
                     'Content-Type must be application/json',

src/Application/Http/Controllers/QrCodeController.php

@@ -123,7 +123,7 @@ final readonly class QrCodeController
             return new HttpResponse(
                 status : Status::BAD_REQUEST,
                 headers: new Headers(['Content-Type' => 'application/json']),
-                body   : json_encode(['error' => 'TOTP URI parameter is required'])
+                body   : json_encode(['error' => 'TOTP URI parameter is required']) ?: '{"error":"Encoding failed"}'
             );
         }
 
@@ -139,7 +139,7 @@ final readonly class QrCodeController
             return new HttpResponse(
                 status : Status::BAD_REQUEST,
                 headers: new Headers(['Content-Type' => 'application/json']),
-                body   : json_encode(['error' => $e->getMessage()])
+                body   : json_encode(['error' => $e->getMessage()]) ?: '{"error":"Encoding failed"}'
             );
         }
     }

src/Application/Http/Examples/BatchExampleController.php

@@ -40,7 +40,7 @@ final readonly class BatchExampleController
         return new HttpResponse(
             status: Status::OK,
             headers: new Headers(['Content-Type' => 'application/json']),
-            body: $this->jsonSerializer->serialize($user, JsonSerializerConfig::pretty())
+            body: $this->jsonSerializer->serializeWithConfig($user, JsonSerializerConfig::pretty())
         );
     }
 
@@ -53,7 +53,7 @@ final readonly class BatchExampleController
             return new HttpResponse(
                 status: Status::BAD_REQUEST,
                 headers: new Headers(['Content-Type' => 'application/json']),
-                body: $this->jsonSerializer->serialize(['error' => 'Title is required'])
+                body: $this->jsonSerializer->serializeWithConfig(['error' => 'Title is required'], JsonSerializerConfig::compact())
             );
         }
 
@@ -68,7 +68,7 @@ final readonly class BatchExampleController
         return new HttpResponse(
             status: Status::CREATED,
             headers: new Headers(['Content-Type' => 'application/json']),
-            body: $this->jsonSerializer->serialize($post, JsonSerializerConfig::pretty())
+            body: $this->jsonSerializer->serializeWithConfig($post, JsonSerializerConfig::pretty())
         );
     }
 
@@ -82,7 +82,7 @@ final readonly class BatchExampleController
             return new HttpResponse(
                 status: Status::BAD_REQUEST,
                 headers: new Headers(['Content-Type' => 'application/json']),
-                body: $this->jsonSerializer->serialize(['error' => 'Invalid JSON data'])
+                body: $this->jsonSerializer->serializeWithConfig(['error' => 'Invalid JSON data'], JsonSerializerConfig::compact())
             );
         }
 
@@ -96,7 +96,7 @@ final readonly class BatchExampleController
         return new HttpResponse(
             status: Status::OK,
             headers: new Headers(['Content-Type' => 'application/json']),
-            body: $this->jsonSerializer->serialize($post, JsonSerializerConfig::pretty())
+            body: $this->jsonSerializer->serializeWithConfig($post, JsonSerializerConfig::pretty())
         );
     }
 
@@ -123,7 +123,7 @@ final readonly class BatchExampleController
         return new HttpResponse(
             status: Status::OK,
             headers: new Headers(['Content-Type' => 'application/json']),
-            body: $this->jsonSerializer->serialize([
+            body: $this->jsonSerializer->serializeWithConfig([
                 'message' => 'Slow operation completed',
                 'delay' => $maxDelay,
                 'timestamp' => $this->clock->now()->format('Y-m-d H:i:s'),