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/Discovery/Events/CacheEvictionEvent.php

@@ -48,6 +48,7 @@ final readonly class CacheEvictionEvent
 
     /**
      * Convert to array for serialization
+     * @return array<string, mixed>
      */
     public function toArray(): array
     {

src/Framework/Discovery/Events/CacheMissEvent.php

@@ -47,6 +47,7 @@ final readonly class CacheMissEvent
 
     /**
      * Convert to array for serialization
+     * @return array<string, mixed>
      */
     public function toArray(): array
     {

src/Framework/Discovery/Events/DiscoveryFailedEvent.php

@@ -5,7 +5,7 @@ declare(strict_types=1);
 namespace App\Framework\Discovery\Events;
 
 use App\Framework\Core\ValueObjects\Timestamp;
-use App\Framework\Discovery\Results\DiscoveryResults;
+use App\Framework\Discovery\Results\DiscoveryRegistry;
 use App\Framework\Discovery\ValueObjects\ScanType;
 use Throwable;
 
@@ -16,7 +16,7 @@ final readonly class DiscoveryFailedEvent
 {
     public function __construct(
         public Throwable $exception,
-        public ?DiscoveryResults $partialResults,
+        public ?DiscoveryRegistry $partialResults,
         public ScanType $scanType,
         public Timestamp $timestamp
     ) {
@@ -33,7 +33,7 @@ final readonly class DiscoveryFailedEvent
             'error' => $this->exception->getMessage(),
             'error_type' => get_class($this->exception),
             'has_partial_results' => $this->hasPartialResults(),
-            'partial_files_count' => $this->partialResults ? count($this->partialResults->toArray()) : 0,
+            'partial_files_count' => $this->partialResults ? $this->partialResults->count() : 0,
             'scan_type' => $this->scanType->value,
             'timestamp' => $this->timestamp->toFloat(),
         ];