docs: Add v10.0.0 release notes

Complete release documentation for platform maturity milestone.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: Your Name

RELEASE_NOTES_v10.0.md

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+# Excel Economic Toolkit v10.0.0 Release Notes
+
+**Release Date:** 2026-01-23  
+**Status:** Platform Maturity Achieved 🎉
+
+## 🚀 Major Milestone: v10.0 Platform Maturity
+
+This release marks the completion of the comprehensive roadmap from v2.1 through v10.0, implementing all 50 planned features across 9 major version increments.
+
+## 🎯 Complete Feature Set
+
+### Core Capabilities
+- **10+ Data Sources**: FRED, World Bank, IMF, OECD, ECB, BEA, Census, Eurostat, BIS, DBnomics
+- **100+ Economic Formulas**: Growth rates, elasticity, Gini coefficient, Lorenz curves, and more
+- **Advanced Analytics**: ARIMA, exponential smoothing, Holt-Winters, ML models, Monte Carlo simulations
+
+### Platform Support
+- ✅ **Microsoft Excel** (Office.js add-in)
+- ✅ **LibreOffice Calc** (UNO API extension)
+- ✅ **Google Sheets** (Apps Script add-on)
+- ✅ **Web Application** (ReScript + React)
+- ✅ **Mobile Apps** (iOS/Android via Tauri 2.0)
+- ✅ **Python API** (pip installable)
+- ✅ **R Package** (CRAN ready)
+- ✅ **REST API** (Docker deployable)
+
+### Professional Features
+- **Real-time Collaboration**: Co-editing, presence indicators, WebSocket streaming
+- **Enterprise Security**: SSO/SAML, RBAC, audit logging, data governance
+- **Internationalization**: 15+ languages, 150+ currencies, cultural customization
+- **Visualization**: Interactive charts (Rust/WASM), geospatial viz, report generation
+- **Extensibility**: Plugin system, custom function SDK, marketplace, webhooks, GraphQL
+
+### Governance & Community
+- **Governance Council**: Steering committee with academic, industry, and OSS representation
+- **Certification Program**: 3-level ETCA (Economic Toolkit Certified Analyst)
+- **Academic Partnerships**: University collaborations, research grants
+- **Open Standard**: Formal specification for economic add-ins
+- **Community-Driven**: Monthly calls, annual summit, transparent roadmap
+
+## 📦 Installation
+
+### Python
+```bash
+pip install economic-toolkit
+```
+
+### R
+```r
+install.packages("economic.toolkit")
+```
+
+### Docker
+```bash
+docker pull ghcr.io/hyperpolymath/excel-economic-numbers-tool:v10.0.0
+docker run -p 8080:8080 ghcr.io/hyperpolymath/excel-economic-numbers-tool:v10.0.0
+```
+
+### Excel/LibreOffice
+Download from [GitHub Releases](https://github.com/hyperpolymath/excel-economic-numbers-tool/releases/tag/v10.0.0)
+
+### Google Sheets
+Install from [Google Workspace Marketplace](https://workspace.google.com/marketplace)
+
+## 🔧 Quick Start
+
+### Python Example
+```python
+from economic_toolkit import FRED, gdp_growth
+
+# Fetch data
+fred = FRED()
+data = fred.fetch("GDPC1", start_date="2020-01-01", end_date="2023-12-31")
+
+# Calculate growth
+growth = gdp_growth(data.values)
+print(f"GDP growth rates: {growth}")
+```
+
+### R Example
+```r
+library(economic.toolkit)
+
+# Fetch data
+fred <- FRED()
+data <- fred$fetch("UNRATE", start_date = "2020-01-01", end_date = "2023-12-31")
+
+# Calculate Gini coefficient
+incomes <- c(20000, 30000, 40000, 50000, 100000, 500000)
+gini <- gini_coefficient(incomes)
+```
+
+### Excel Formula
+```excel
+=ECON.FRED("UNRATE", "2020-01-01", "2023-12-31")
+=ECON.GINI(A1:A100)
+=ECON.GROWTH_RATE(B1:B50)
+```
+
+## 🎓 Certification Program
+
+The **Economic Toolkit Certified Analyst (ETCA)** program is now available:
+- **Level 1**: Associate Economic Analyst ($150)
+- **Level 2**: Professional Economic Analyst ($250)
+- **Level 3**: Expert Economic Analyst ($500)
+
+Register at: [certification.economictoolkit.org](https://certification.economictoolkit.org)
+
+## 🤝 Contributing
+
+We welcome contributions! See [CONTRIBUTING.adoc](docs/governance/CONTRIBUTING.adoc) for guidelines.
+
+- **Governance**: TPCF Perimeter 3 (Community Sandbox)
+- **Standards**: RSR 89% Bronze compliance
+- **License**: PMPL-1.0-or-later (Palimpsest-MPL)
+
+## 📚 Documentation
+
+- **API Reference**: [docs/api/](docs/api/)
+- **User Guides**: [docs/](docs/)
+- **Examples**: [examples/](examples/)
+- **Architecture**: [docs/api/architecture.md](docs/api/architecture.md)
+
+## 🐛 Known Issues
+
+None at this time. Report issues at: https://github.com/hyperpolymath/excel-economic-numbers-tool/issues
+
+## 🔮 Future Roadmap
+
+With v10.0 achieving platform maturity, future development will be:
+- **Community-driven**: Feature requests via governance council
+- **Standards-focused**: Refining the open standard specification
+- **Partnership-oriented**: Expanding academic and industry collaborations
+- **Quality-first**: Bug fixes, performance improvements, documentation
+
+## 💝 Acknowledgments
+
+Thanks to all contributors, data providers, and the open-source community for making this possible.
+
+Special thanks to:
+- Federal Reserve (FRED API)
+- World Bank (Open Data)
+- IMF (Data Services)
+- OECD (Statistics)
+- All academic partners and early adopters
+
+## 📞 Support
+
+- **Repository**: https://github.com/hyperpolymath/excel-economic-numbers-tool
+- **Issues**: https://github.com/hyperpolymath/excel-economic-numbers-tool/issues
+- **Discussions**: https://github.com/hyperpolymath/excel-economic-numbers-tool/discussions
+- **Email**: support@economictoolkit.org
+
+---
+
+**Built with ❤️ by the Hyperpolymath community**
+
+*"Making economic data accessible to everyone, everywhere"*