Fix Redis driver bulkUpdate and bulkDelete for Redis v4 client

- Fixed bulkUpdate to handle Redis v4 client pipeline results (direct values, not tuples)
- Fixed bulkDelete to parse Redis v4 pipeline results correctly
- Added guard to prevent executing empty pipeline in bulkUpdate
- Added explanatory comments about Redis v4 client behavior

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

packages/drivers/redis/src/index.ts

@@ -563,8 +563,8 @@ export class RedisDriver implements Driver, DriverInterface {
 
                     for (let i = 0; i < command.updates.length; i++) {
                         const update = command.updates[i];
-                        const result = getResults?.[i] as any;
-                        const existingData = result?.[1];
+                        // Redis v4 client returns array of results directly, not [error, result] tuples
+                        const existingData = getResults?.[i];
 
                         if (existingData && typeof existingData === 'string') {
                             const existingDoc = JSON.parse(existingData);
@@ -581,7 +581,10 @@ export class RedisDriver implements Driver, DriverInterface {
                         }
                     }
 
-                    await setPipeline.exec();
+                    // Only execute pipeline if there are commands to execute
+                    if (updateResults.length > 0) {
+                        await setPipeline.exec();
+                    }
 
                     return {
                         success: true,
@@ -602,7 +605,9 @@ export class RedisDriver implements Driver, DriverInterface {
                     }
 
                     const deleteResults = await deletePipeline.exec();
-                    const deleted = deleteResults?.filter((r: any) => r && r[1] > 0).length || 0;
+                    // Redis v4 client returns array of results directly, not [error, result] tuples
+                    // Each DEL returns 1 if key existed and was deleted, 0 if key didn't exist
+                    const deleted = deleteResults?.filter((r: any) => r > 0).length || 0;
 
                     return {
                         success: true,