docs: Update CHANGELOG.md for v5.1.3 release structure

Move status change from v5.1.2 to v5.1.3 for correct versioning.

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

Author: silversurfer562

CHANGELOG.md

@@ -7,6 +7,16 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [5.1.3] - 2026-01-29
+
+### Changed
+
+- **Project Status**: Updated from Beta to Production/Stable
+  - Framework has proven stability and reliability in production environments
+  - Comprehensive test coverage (80%+) and extensive real-world usage
+  - Mature API with semantic versioning commitment
+  - PyPI classifier updated to "Development Status :: 5 - Production/Stable"
+
 ## [5.1.2] - 2026-01-29
 
 ### Added
@@ -19,14 +29,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - Updated `README.md` with links to acknowledgements and contributors documentation
   - Demonstrates respect for open source community and proper attribution practices
 
-### Changed
-
-- **Project Status**: Updated from Beta to Production/Stable
-  - Framework has proven stability and reliability in production environments
-  - Comprehensive test coverage (80%+) and extensive real-world usage
-  - Mature API with semantic versioning commitment
-  - PyPI classifier updated to "Development Status :: 5 - Production/Stable"
-
 ### Documentation
 
 - Proper recognition of all open source contributors whose work makes Empathy Framework possible