📚 docs: update README to reflect Phase 12 completion

Author: MarcelOlsen

.changeset/phase-12-completion.md

@@ -0,0 +1,11 @@
+---
+"@marcelolsen/mini-react": patch
+---
+
+Update documentation to reflect Phase 12 completion
+
+- 📚 Mark Phase 12 (Performance Optimization Suite) as complete
+- 🎯 Update current status to reflect 272 passing tests
+- ✨ Document implemented features: memo, useMemo, useCallback
+- 📊 Update progress tracking for stable release track
+- 🔄 Reflect transition from Alpha to Stable release phase

README.md

@@ -26,7 +26,7 @@ A learning project to build a simplified React-like library from scratch, with a
     - [Phase 11: Essential Hooks (useRef & useReducer) ✅](#phase-11-essential-hooks-useref--usereducer-)
     - [🎉 **ALPHA RELEASE v0.1.0** - Complete Core React-like Functionality](#-alpha-release-v010---complete-core-react-like-functionality)
   - [🚀 **STABLE RELEASE TRACK** (Phases 12-20)](#-stable-release-track-phases-12-20)
-    - [Phase 12: Performance Optimization Suite](#phase-12-performance-optimization-suite)
+    - [Phase 12: Performance Optimization Suite ✅](#phase-12-performance-optimization-suite-)
     - [Phase 13: Error Boundaries & Resilience](#phase-13-error-boundaries--resilience)
     - [Phase 14: Async Features & Suspense](#phase-14-async-features--suspense)
     - [Phase 15: Concurrent Features (Advanced)](#phase-15-concurrent-features-advanced)
@@ -60,19 +60,19 @@ Each phase includes clear specifications, working implementations, and extensive
 
 ## Current Status
 
-🆕 **Current Phase**: Alpha Release Track - Phase 11 ✅ **COMPLETE**
+🆕 **Current Phase**: Stable Release Track - Phase 12 ✅ **COMPLETE**
 
 **Latest Achievements**:
 
-- ✅ **Phase 11 Complete**: Essential Hooks - useRef & useReducer implementation with comprehensive test coverage
-- ✅ **Alpha Release Ready**: All 11 core phases completed - complete React-like functionality achieved
-- ✅ **261 Tests Passing**: Comprehensive test suite covering all functionality including all hooks and advanced reconciliation
+- ✅ **Phase 12 Complete**: Performance Optimization Suite - memo, useMemo, useCallback with comprehensive test coverage
+- ✅ **Enhanced Performance**: React.memo equivalent for component memoization and optimization hooks
+- ✅ **272 Tests Passing**: Comprehensive test suite covering all functionality including performance optimizations
 - ✅ **Zero Linter Issues**: Clean codebase with consistent formatting and biome configuration
-- ✅ **Complete Hook Ecosystem**: useState, useEffect, useContext, useRef, and useReducer hooks fully implemented
+- ✅ **Complete Performance Toolkit**: memo, useMemo, useCallback hooks for production-grade optimization
 - ✅ **Production-Ready**: Robust error handling, TypeScript support, and comprehensive edge case coverage
-- ✅ **Package Preparation**: Ready for npm registry publication
+- ✅ **Package Preparation**: Ready for npm registry publication with performance features
 
-**Alpha Release Progress**: 11/11 phases complete (100% complete) ✨
+**Stable Release Progress**: 1/9 phases complete (11% complete) 🚀
 
 **Immediate Milestones**:
 
@@ -589,13 +589,17 @@ mini-react/
 
 ### 🚀 **STABLE RELEASE TRACK** (Phases 12-20)
 
-#### Phase 12: Performance Optimization Suite
+#### Phase 12: Performance Optimization Suite ✅
 
-- Memoization (React.memo equivalent)
-- useMemo and useCallback hooks
-- Profiling and performance measurement tools
-- Bundle size optimization
-- Runtime performance improvements
+**Features:**
+
+- ✅ Memoization (React.memo equivalent) for component optimization
+- ✅ useMemo hook for expensive computation memoization
+- ✅ useCallback hook for function reference stability
+- ✅ Shallow prop comparison with custom comparison support
+- ✅ Performance tracking and measurement utilities
+- ✅ Comprehensive test coverage for all optimization features
+- ✅ TypeScript support with proper type inference and safety
 
 #### Phase 13: Error Boundaries & Resilience