refactor: CLI cleanup and documentation updates

- Refactor CLI metric computation to eliminate code duplication
- Update version format to PEP 440 compliance (0.1.0.dev0)
- Cache Settings instance via @lru_cache for performance
- Document composite validators' protocol deviation
- Consolidate redundant empty checks in ROUGE-L computation
- Add Phase 10 (Portfolio Demos) to implementation plan

changelog.md

@@ -7,9 +7,22 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+
+- Refactored CLI metric computation to eliminate code duplication
+- Version format updated from `0.1.0-dev` to `0.1.0.dev0` (PEP 440 compliance)
+- Settings instance is now cached via `@lru_cache` for better performance
+- Documented composite validators' intentional deviation from `Check` protocol return type
+
 ### Fixed
 
+- Consolidated redundant empty checks in ROUGE-L computation
 - Fixed README example using incorrect property names (`grade_level` → `flesch_kincaid_grade`, `reading_ease` → `flesch_reading_ease`)
+
+### Documentation
+
+- Added Phase 10 (Portfolio Demos) to implementation plan: Streamlit demo and Jupyter notebooks
+- Updated project plan with portfolio demo section
 - Fixed potential crash in ROUGE metric when all references are empty after tokenisation
 - Fixed potential division by zero in readability metric when text has no sentence endings
 - Fixed unbounded cache growth in `SemanticSimilarity` by implementing LRU eviction with configurable max size