docs: create release notes for v1.5.1

Author: moreirawebmaster

RELEASE_v1.5.1.md

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+# Engine Tracking v1.5.1
+
+## 📚 Public API Documentation Release
+
+This release focuses on improving developer experience through comprehensive public API documentation and resolving code quality issues.
+
+## 🎯 What's New
+
+### ✅ Complete Public API Documentation
+- **562+ lines** of documentation added across **32 files**
+- **All public members** now have proper Dartdoc comments (///)
+- **Full compliance** with `public_member_api_docs` lint rule
+- **Zero lint issues** - from 38 issues to 0
+
+### 🔧 Bug Fixes
+- **Deprecated Warning Resolved**: Fixed `userId` deprecation warning in Clarity adapter
+- **Code Quality**: Improved maintainability and readability
+- **Future-Proof**: Resolved deprecation warnings for upcoming versions
+
+## 📊 Technical Details
+
+### Files Documented
+- `lib/src/bug_tracking/engine_bug_tracking.dart` - Methods and getters
+- `lib/src/config/engine_http_tracking_config.dart` - Class and constructor
+- `lib/src/http/engine_http_override.dart` - Class and constructor  
+- `lib/src/observers/engine_navigator_observer.dart` - Class and fields
+- `lib/src/session/engine_session.dart` - Class, singleton, getters and methods
+- `lib/src/utils/engine_util.dart` - Typedefs and utility functions
+- `lib/src/widgets/engine_mask_widget.dart` - Constructors and fields
+- `lib/src/widgets/engine_stateful_widget.dart` - Class, constructors, getters and methods
+- `lib/src/widgets/engine_stateless_widget.dart` - Constructor
+- `lib/src/widgets/engine_widget.dart` - Constructor
+
+### Quality Metrics
+- **Lint Status**: ✅ 0 issues found (`dart analyze`)
+- **Documentation Coverage**: ✅ 100% of public API members
+- **Code Standards**: ✅ Follows project documentation standards
+- **Breaking Changes**: ❌ None - only documentation additions
+
+## 🚀 Benefits
+
+1. **Better Developer Experience**: Complete API documentation for all public members
+2. **Lint Compliance**: Full compliance with `public_member_api_docs` rule
+3. **Code Quality**: Improved code maintainability and readability
+4. **Future-Proof**: Resolved deprecation warnings for upcoming versions
+
+## 📦 Installation
+
+```yaml
+dependencies:
+  engine_tracking: ^1.5.1
+```
+
+## 🔄 Migration
+
+No migration required - this is a documentation-only release with no breaking changes.
+
+## 📝 Changelog
+
+See [CHANGELOG.md](CHANGELOG.md) for detailed information about this release.
+
+---
+
+**Engine Tracking** - Complete Flutter tracking, analytics, and bug reporting library with support for Firebase, Microsoft Clarity, Grafana Faro, Splunk, and Google Cloud Logging.