Refactor memory driver to use Mingo for MongoDB-like queries

- Add mingo@^7.1.1 as dependency for MongoDB query engine
- Replace custom filter/sort logic with Mingo Query API
- Convert ObjectQL filters to MongoDB query format
- Use Mingo for filtering, counting, distinct, updateMany, deleteMany
- Keep manual sort implementation to avoid CJS build issues
- Update package description to reflect Mingo integration
- Update README and MIGRATION docs to mention Mingo
- Maintain 100% backward compatibility with existing API

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

Author: Copilot

packages/drivers/memory/MIGRATION.md

@@ -2,18 +2,35 @@
 
 ## Overview
 
-The Memory driver has been migrated to support the standard `DriverInterface` from `@objectstack/spec` while maintaining full backward compatibility with the existing `Driver` interface from `@objectql/types`.
+The Memory driver has been refactored to use **Mingo** (MongoDB query engine for in-memory objects) for query processing, while maintaining full backward compatibility with the existing `Driver` interface from `@objectql/types`. This brings MongoDB-like query capabilities to the in-memory driver.
 
-**Package Version**: 3.0.1 (maintained for changeset compatibility)  
+**Package Version**: 4.0.0  
 **DriverInterface Version**: v4.0 compliant  
 **Completion Date**: January 23, 2026  
-**Status**: ✅ Fully compliant with DriverInterface v4.0
+**Status**: ✅ Fully compliant with DriverInterface v4.0 and Mingo-powered
 
-**Note**: The driver implements DriverInterface v4.0 specification, but the package version remains at 3.0.1 due to changeset fixed group constraints.
+## Key Changes
 
-## What Changed
+### 1. Mingo Integration
 
-### 1. Driver Metadata
+The driver now uses **Mingo** for query processing, which provides:
+
+- **MongoDB Query Operators**: Full support for MongoDB query syntax
+- **High Performance**: Optimized query execution for in-memory data
+- **Standard Compliance**: MongoDB-compatible query semantics
+
+#### What is Mingo?
+
+Mingo is a MongoDB query language for in-memory JavaScript objects. It brings the power of MongoDB queries to client-side and server-side JavaScript applications without requiring a MongoDB server.
+
+#### Benefits
+
+- **Consistency**: Same query syntax as MongoDB
+- **Expressiveness**: Rich query operators ($gt, $lt, $in, $regex, etc.)
+- **Reliability**: Well-tested MongoDB query semantics
+- **Performance**: Optimized for in-memory operations
+
+### 2. Driver Metadata
 
 The driver now exposes metadata for ObjectStack compatibility:
 

packages/drivers/memory/README.md

@@ -1,14 +1,14 @@
 # Memory Driver for ObjectQL
 
-> ✅ **Production-Ready** - A high-performance in-memory driver for testing, development, and edge environments.
+> ✅ **Production-Ready** - A high-performance in-memory driver powered by Mingo for testing, development, and edge environments.
 
 ## Overview
 
-The Memory Driver is a zero-dependency, production-ready implementation of the ObjectQL Driver interface that stores data in JavaScript Maps. It provides full query support with high performance, making it ideal for scenarios where persistence is not required.
+The Memory Driver is a production-ready implementation of the ObjectQL Driver interface that stores data in JavaScript Maps and uses **Mingo** (MongoDB query engine for in-memory objects) for query processing. It provides full MongoDB-like query support with high performance, making it ideal for scenarios where persistence is not required.
 
 ## Features
 
-- ✅ **Zero Dependencies** - No external packages required
+- ✅ **MongoDB Query Engine** - Powered by Mingo for MongoDB-compatible queries
 - ✅ **Full Query Support** - Filters, sorting, pagination, field projection
 - ✅ **High Performance** - No I/O overhead, all operations in-memory
 - ✅ **Bulk Operations** - createMany, updateMany, deleteMany

packages/drivers/memory/package.json

@@ -1,7 +1,7 @@
 {
   "name": "@objectql/driver-memory",
   "version": "4.0.0",
-  "description": "In-memory driver for ObjectQL - Fast, zero-dependency storage with DriverInterface v4.0 compliance",
+  "description": "In-memory driver for ObjectQL - Fast MongoDB-like query engine powered by Mingo with DriverInterface v4.0 compliance",
   "keywords": [
     "objectql",
     "driver",
@@ -21,7 +21,8 @@
   },
   "dependencies": {
     "@objectql/types": "workspace:*",
-    "@objectstack/spec": "^0.2.0"
+    "@objectstack/spec": "^0.2.0",
+    "mingo": "^7.1.1"
   },
   "devDependencies": {
     "@types/jest": "^29.0.0",