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/Cryptography/DigitalSignatureResult.php

@@ -130,6 +130,7 @@ final readonly class DigitalSignatureResult
 
     /**
      * Export to array (for serialization)
+     * @return array<string, mixed>
      */
     public function toArray(): array
     {
@@ -149,6 +150,7 @@ final readonly class DigitalSignatureResult
 
     /**
      * Create from array (for deserialization)
+     * @param array<string, mixed> $data
      */
     public static function fromArray(array $data): self
     {
@@ -242,6 +244,7 @@ final readonly class DigitalSignatureResult
 
     /**
      * Get summary information (safe for logging)
+     * @return array<string, mixed>
      */
     public function getSummary(): array
     {