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/Config/ConfigValidator.php

@@ -19,12 +19,15 @@ final readonly class ConfigValidator
     /**
      * Validate selected environment variables and return a list of issues.
      * Each issue contains: key, issue, severity, recommendation.
+     * @return array<int, array<string, string>>
      */
     public function validate(): array
     {
+        /** @var array<int, array<string, string>> */
         $issues = [];
 
         // APP_ENV validation
+        /** @var array<int, string> */
         $allowedEnvs = ['development', 'testing', 'production'];
         $appEnv = $this->env->getString(EnvKey::APP_ENV, 'production');
         if (! in_array($appEnv, $allowedEnvs, true)) {
@@ -76,14 +79,16 @@ final readonly class ConfigValidator
         }
 
         // Rate limit values if present: must be non-negative
-        foreach ([
+        /** @var array<int, string> */
+        $rateKeys = [
             'RATE_LIMIT_DEFAULT',
             'RATE_LIMIT_WINDOW',
             'RATE_LIMIT_AUTH',
             'RATE_LIMIT_AUTH_WINDOW',
             'RATE_LIMIT_API',
             'RATE_LIMIT_API_WINDOW',
-        ] as $rateKey) {
+        ];
+        foreach ($rateKeys as $rateKey) {
             if ($this->env->has($rateKey)) {
                 $value = (int) $this->env->get($rateKey);
                 if ($value < 0) {
@@ -102,6 +107,7 @@ final readonly class ConfigValidator
 
     /**
      * Validate and log issues. Returns the list of issues for optional handling.
+     * @return array<int, array<string, string>>
      */
     public function validateAndReport(): array
     {