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/Database/Schema/Index/Analysis/IndexUsageAnalyzer.php

@@ -120,6 +120,7 @@ final class IndexUsageAnalyzer
 
     /**
      * Get MySQL index usage statistics
+     * @return array<array<string, mixed>>
      */
     private function getMySqlIndexUsageStatistics(?string $table = null): array
     {
@@ -183,6 +184,7 @@ final class IndexUsageAnalyzer
 
     /**
      * Get MySQL unused indexes
+     * @return array<array<string, mixed>>
      */
     private function getMySqlUnusedIndexes(?string $table = null, int $minDaysSinceCreation = 30): array
     {
@@ -226,6 +228,7 @@ final class IndexUsageAnalyzer
 
     /**
      * Get MySQL duplicate indexes
+     * @return array<array<string, mixed>>
      */
     private function getMySqlDuplicateIndexes(?string $table = null): array
     {
@@ -280,6 +283,7 @@ final class IndexUsageAnalyzer
 
     /**
      * Get MySQL oversized indexes
+     * @return array<array<string, mixed>>
      */
     private function getMySqlOversizedIndexes(?string $table = null, int $sizeThresholdMb = 100): array
     {
@@ -318,6 +322,7 @@ final class IndexUsageAnalyzer
 
     /**
      * Get MySQL fragmented indexes
+     * @return array<array<string, mixed>>
      */
     private function getMySqlFragmentedIndexes(?string $table = null, float $fragmentationThreshold = 0.3): array
     {
@@ -354,6 +359,7 @@ final class IndexUsageAnalyzer
 
     /**
      * Get PostgreSQL index usage statistics
+     * @return array<array<string, mixed>>
      */
     private function getPostgreSqlIndexUsageStatistics(?string $table = null): array
     {
@@ -389,6 +395,7 @@ final class IndexUsageAnalyzer
 
     /**
      * Get PostgreSQL unused indexes
+     * @return array<array<string, mixed>>
      */
     private function getPostgreSqlUnusedIndexes(?string $table = null, int $minDaysSinceCreation = 30): array
     {
@@ -427,6 +434,7 @@ final class IndexUsageAnalyzer
 
     /**
      * Get PostgreSQL duplicate indexes
+     * @return array<array<string, mixed>>
      */
     private function getPostgreSqlDuplicateIndexes(?string $table = null): array
     {
@@ -491,6 +499,7 @@ final class IndexUsageAnalyzer
 
     /**
      * Get PostgreSQL oversized indexes
+     * @return array<array<string, mixed>>
      */
     private function getPostgreSqlOversizedIndexes(?string $table = null, int $sizeThresholdMb = 100): array
     {
@@ -530,6 +539,7 @@ final class IndexUsageAnalyzer
 
     /**
      * Get PostgreSQL fragmented indexes
+     * @return array<array<string, mixed>>
      */
     private function getPostgreSqlFragmentedIndexes(?string $table = null, float $fragmentationThreshold = 0.3): array
     {