docs(changelog): update for v3.0.0

CHANGELOG.md

@@ -5,10 +5,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [v3.0.0] - 2025-07-22
 
 ### Added
 
+- Refactored codebase from monolithic script to modular package structure for improved maintainability and scalability
+- Added git commit message template and setup for standardized commit messages
+- Completed CLI module separation for clearer entry points and usage
 - Environment variable support for Dataverse configuration
 - Support for overriding sensitive credentials using environment variables:
   - `DATAVERSE_URL` - Dataverse server URL
@@ -27,6 +30,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Automated tag-based release workflow with GitLab CI
 - Release documentation in `docs/source/release-workflow.rst`
 - Release process documentation in `CONTRIBUTING.md`
+- Removed obsolete monolithic script reflecting transition to modular package
+- Harmonized gitlint configuration with commitlint standards
+- Prevented duplicate pre-commit hook execution across environments
 
 ### Changed
 
@@ -36,6 +42,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Update pre-commit CI messages to follow conventional commit format
 - Improve commit message documentation with validation examples and best practices
 - Enhanced GitLab CI pipeline with automated release stages
+- Added type hints to commit message linting script
 
 ### Added (CI/CD)