Update CHANGELOG: add 0.8.1-beta release notes and clean up Unreleased section

Author: ocots

CHANGELOG.md

@@ -5,6 +5,25 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.8.1-beta] - 2026-02-10
+
+### Changed
+
+- **Project Configuration**: Updated GitHub workflows to use CTActions shared workflows
+  - Coverage workflow now uses `control-toolbox/CTActions/.github/workflows/coverage.yml@main`
+  - Documentation workflow now uses `control-toolbox/CTActions/.github/workflows/documentation.yml@main`
+  - Improved consistency with other Control Toolbox projects
+
+- **Repository Management**: Enhanced .gitignore configuration
+  - Added `.agent/`, `.windsurf/`, and `.reports/` directories to gitignore
+  - Cleaned up Git history by removing previously tracked temporary directories
+  - Better separation between source code and development artifacts
+
+### Fixed
+
+- Removed development artifacts from Git tracking while preserving local files
+- Improved repository hygiene and reduced noise in version control
+
 ## [0.8.0-beta] - 2026-02-04
 
 ### Breaking
@@ -53,48 +72,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-### Added
-
-- **Defensive Validation System**: Comprehensive validation infrastructure for OCP components
-  - New `name_validation.jl` module with helper functions (`__collect_used_names`, `__has_name_conflict`, `__validate_name_uniqueness`)
-  - Global uniqueness validation for component names across state, control, variable, and time
-  - Inter-component name conflict detection (e.g., state component name vs control name)
-  - Special handling for scalar components (dim=1) where name == component is allowed
-  - Support for empty variables (q=0) without name conflicts
-
-- **Component Validations**: Enhanced input validation for all OCP components
-  - `state!`: Name uniqueness validation with inter-component conflict checks
-  - `control!`: Name uniqueness validation with inter-component conflict checks
-  - `variable!`: Name uniqueness validation with inter-component conflict checks (supports q=0)
-  - `time!`: Name uniqueness validation and `t0 < tf` bounds validation
-  - `objective!`: Case-insensitive criterion validation (accepts `:min`, `:max`, `:MIN`, `:MAX`)
-  - `constraint!`: Element-wise `lb ≤ ub` bounds validation for all constraint types
-
-- **Documentation**: Complete `# Throws` sections for all validated functions
-  - Clear documentation of `CTBase.IncorrectArgument` exceptions
-  - Clear documentation of `CTBase.UnauthorizedCall` exceptions
-  - Detailed error messages for validation failures
-
-- **Test Coverage**: Extensive test suites for validation logic
-  - 323 unit tests for component validations (100% pass rate)
-  - 53 integration tests covering complex scenarios (100% pass rate)
-  - Tests for high-dimensional systems (dim > 3)
-  - Tests for Unicode and special characters in names
-  - Tests for edge cases (infinity bounds, equality constraints, etc.)
-  - Tests for multiple constraint types combined
-  - Type stability tests with `@inferred` where applicable
-
-### Changed
-
-- **Objective Criterion**: Now accepts case-insensitive input (`:min`, `:max`, `:MIN`, `:MAX`)
-  - All criterion values are normalized to lowercase (`:min` or `:max`) for internal consistency
-  - Maintains backward compatibility with existing code
-
-### Fixed
-
-- Eliminated duplicate function definition warnings in `test_objective.jl`
-- Improved error messages for name conflicts to be more descriptive and actionable
-
 ## [0.7.1-beta] - 2026-01-22
 
 ### Added