docs: Update README with Phase 3 completion status

- Add Phase 3 enterprise data protocol features to highlights
- Update roadmap to reflect Phase 1-3 completion
- Add link to PHASE3_IMPLEMENTATION.md for detailed documentation
- Highlight new capabilities: Vector fields, Query AST, Smart Validation, Multi-datasource support

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

Author: Copilot

README.md

@@ -78,6 +78,14 @@ npm install @object-ui/react @object-ui/components @object-ui/data-objectstack
 - Comprehensive documentation
 - Active development and support
 
+### 🔥 **Phase 3: Enterprise Data Protocol** (NEW!)
+- **Advanced Field Types**: Vector (AI embeddings), Grid (sub-tables), Formula, Summary
+- **Query AST Builder**: SQL-like queries with joins, aggregations, subqueries
+- **Smart Validation**: 30+ rules, async validation, cross-field dependencies
+- **Multi-Datasource**: Health monitoring, connection pooling, query caching
+- **40+ Filter Operators**: Date ranges, lookup filters, full-text search
+- **Object Inheritance**: Triggers, advanced permissions, metadata caching
+
 ## Why Object UI?
 
 ### For You as a Developer
@@ -292,17 +300,31 @@ Object UI is perfect for:
 
 ## 🛣️ Roadmap
 
-**Q1 2026** (Available March 2026):
-- ✅ Core schema rendering
-- ✅ 20+ production-ready components
-- ✅ Expression system
+**Phase 1-2 (Q4 2025 - Q1 2026)** ✅ **COMPLETED**:
+- ✅ Core schema rendering engine
+- ✅ 40+ production-ready components (Shadcn + Tailwind)
+- ✅ Expression system with field references
+- ✅ Action system (AJAX, chaining, conditions)
+- ✅ Theme system (light/dark mode)
+- ✅ Report builder with exports
 - ✅ Visual designer (beta)
 
-**Q2-Q4 2026**:
-- 🔄 Advanced data binding
-- 🔄 Real-time collaboration
-- 🔄 Mobile components
+**Phase 3 (Q1-Q2 2026)** ✅ **COMPLETED**:
+- ✅ **Advanced Field Types**: Vector (AI embeddings), Grid (sub-tables), Formula, Summary
+- ✅ **ObjectSchema Enhancements**: Inheritance, triggers, advanced permissions, metadata caching
+- ✅ **QuerySchema AST**: SQL-like query building with joins, aggregations, subqueries
+- ✅ **Advanced Filtering**: 40+ operators, date ranges, lookup filters, full-text search
+- ✅ **Validation Engine**: 30+ rules, async validation, cross-field validation
+- ✅ **DriverInterface**: Transactions, batch operations, connection pooling, query caching
+- ✅ **DatasourceSchema**: Multi-datasource management, health monitoring
+
+**Phase 4+ (Q2-Q4 2026)**:
+- 🔄 Real-time collaboration features
+- 🔄 Mobile-optimized components
 - 🔄 AI-powered schema generation
+- 🔄 Advanced workflow automation
+
+See [PHASE3_IMPLEMENTATION.md](./PHASE3_IMPLEMENTATION.md) for detailed Phase 3 documentation.
 
 ## 🤝 Contributing