add v0.2.0 release note

Author: sungjun-lee2

RELEASE_NOTES_v0.2.0.md

@@ -0,0 +1,54 @@
+# 🎉 v0.2.0 - Major Refactoring to Declarative Architecture
+
+This release represents a complete architectural overhaul, transforming the codebase from procedural to a declarative, functional programming style.
+
+## ✨ New Features
+- **Enhanced duplicate prevention**: Smarter detection of existing ticket numbers and branch segments in commit messages
+- **Declarative validation rules**: Easily configurable and extensible validation logic
+- **Modular message processors**: Clean separation of different message processing strategies
+- **Functional pipeline architecture**: Improved code maintainability and readability
+
+## 🔧 Technical Improvements
+- **Complete code refactoring**: Transformed from procedural to declarative/functional programming style
+- **Type safety enhancements**: Added comprehensive TypeScript types for better development experience
+- **Pure functions**: All utility functions are now pure and easily testable
+- **Immutable state management**: Predictable data flow with immutable state objects
+- **Composable architecture**: Easy to extend with new validation rules and processors
+
+## 🧪 Testing
+- **Comprehensive test suite**: 31 test cases covering all functionality
+- **Enhanced test coverage**: Tests for all new declarative components
+- **Duplicate prevention tests**: Specific tests for improved duplicate detection logic
+
+## 🏗️ Architecture Changes
+- **ValidationRule system**: Declarative rules for commit processing validation
+- **MessageProcessor system**: Modular processors for different commit message formats
+- **Functional pipeline**: Clean data transformation pipeline using functional composition
+- **State-based processing**: All processing based on immutable state objects
+
+## 🚀 Performance & Maintainability
+- **Improved modularity**: Each component has a single responsibility
+- **Better error handling**: More robust error handling throughout the pipeline
+- **Easier debugging**: Clear separation of concerns and better logging
+- **Extensible design**: Simple to add new features without touching existing code
+
+## 🐛 Bug Fixes
+- Fixed edge cases in duplicate detection logic
+- Improved handling of malformed commit messages
+- Better error recovery in file operations
+
+## 📦 Installation & Upgrade
+```bash
+npm install -g @253eosam/[email protected]
+```
+
+## 🔄 Migration
+This version maintains backward compatibility with all existing configurations. No migration steps required.
+
+## 📝 Package Information
+- **Package Size**: 8.5 kB (tarball)
+- **Unpacked Size**: 51.7 kB
+- **Total Files**: 20
+- **Registry**: https://www.npmjs.com/package/@253eosam/commit-from-branch
+
+**Full Changelog**: Compare v0.1.5...v0.2.0 on GitHub