Add development plan reference to README

Co-authored-by: huangyiirene <7665279+huangyiirene@users.noreply.github.com>

Author: Copilot

README.md

@@ -135,6 +135,23 @@ bootstrap();
 
 ---
 
+## 📋 Development & Roadmap
+
+Want to contribute or see what's coming next?
+
+- **[Development Plan (Q1 2026)](./DEVELOPMENT_PLAN.md)** - Detailed implementation plan for upcoming features
+- **[Long-term Roadmap](./ROADMAP.md)** - Strategic vision through 2026 and beyond
+- **[Architecture Guide](./ARCHITECTURE.md)** - Deep dive into system design
+- **[Contributing Guide](./CONTRIBUTING.md)** - How to contribute to ObjectOS
+
+**Key Q1 2026 Goals:**
+- 🔐 Production-grade permission system (Object/Field/Record-level)
+- 🪝 Complete lifecycle hooks system
+- 🔗 Full relationship support (Lookup, Master-Detail, Many-to-Many)
+- 🧪 80%+ test coverage
+
+---
+
 ## ⚖️ License & Commercial Usage
 
 **ObjectOS is open-source software licensed under the [GNU Affero General Public License v3.0 (AGPLv3)](https://www.google.com/search?q=AGPLv3).**