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/PdoConnection.php

@@ -27,7 +27,7 @@ final class PdoConnection implements ConnectionInterface
 
             return $statement->rowCount();
         } catch (\PDOException $e) {
-            throw new DatabaseException("Failed to execute query: {$e->getMessage()}", 0, $e);
+            throw DatabaseException::simple("Failed to execute query: {$e->getMessage()}", $e);
         }
     }
 
@@ -39,7 +39,7 @@ final class PdoConnection implements ConnectionInterface
 
             return new PdoResult($statement);
         } catch (\PDOException $e) {
-            throw new DatabaseException("Failed to execute query: {$e->getMessage()} --- SQL: {$sql} PARAMETERS: {".implode(", ", $parameters)."}", 0, $e);
+            throw DatabaseException::simple("Failed to execute query: {$e->getMessage()} --- SQL: {$sql} PARAMETERS: {".implode(", ", $parameters)."}", $e);
         }
     }
 
@@ -69,7 +69,7 @@ final class PdoConnection implements ConnectionInterface
         try {
             $this->pdo->beginTransaction();
         } catch (\PDOException $e) {
-            throw new DatabaseException("Failed to begin transaction: {$e->getMessage()}", 0, $e);
+            throw DatabaseException::simple("Failed to begin transaction: {$e->getMessage()}", $e);
         }
     }
 
@@ -78,7 +78,7 @@ final class PdoConnection implements ConnectionInterface
         try {
             $this->pdo->commit();
         } catch (\PDOException $e) {
-            throw new DatabaseException("Failed to commit transaction: {$e->getMessage()}", 0, $e);
+            throw DatabaseException::simple("Failed to commit transaction: {$e->getMessage()}", $e);
         }
     }
 
@@ -87,7 +87,7 @@ final class PdoConnection implements ConnectionInterface
         try {
             $this->pdo->rollBack();
         } catch (\PDOException $e) {
-            throw new DatabaseException("Failed to rollback transaction: {$e->getMessage()}", 0, $e);
+            throw DatabaseException::simple("Failed to rollback transaction: {$e->getMessage()}", $e);
         }
     }