Add CHANGELOG.md for initial releases

Author: MarceloClaro

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [v4.2.0] - 2026-05-24
+### Added
+- Refined the ecosystem structure and improved repository organization.
+- Expanded technical and conceptual documentation for the multi-agent platform.
+- Strengthened the project foundation for future integrations, automations, and operational growth.
+
+### Changed
+- Improved the clarity of the ecosystem architecture presentation.
+- Increased project maturity for release management and future versioning.
+
+## [v4.0.0] - 2026-05-24
+### Added
+- Consolidated the multi-agent architecture vision of the OpenCode Ecosystem.
+- Expanded the structured technical artifacts and project documentation.
+- Prepared the repository for scalability across specialized agents and autonomous flows.
+
+### Changed
+- Improved overall repository structure and architectural clarity.
+- Strengthened the conceptual and scientific narrative of the platform.
+
+## [v1.0.0] - 2026-05-24
+### Added
+- Initial public release of the OpenCode Ecosystem.
+- Introduced the foundational structure of the platform.
+- Published the first documented vision for a coordinated multi-agent AI ecosystem.
+
+### Changed
+- Established the initial base for future evolution of the project.