docs: add CHANGELOG.md files for initial 0.1.0 release

Author: josephfusco

packages/toolbar/CHANGELOG.md

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+# Changelog
+
+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).
+
+## [0.1.0] - 2025-01-09
+
+### Added
+- Initial release of @wpengine/hwp-toolbar
+- Framework-agnostic core toolbar with modern state management
+- React adapter with hooks (useToolbar, useToolbarState, useWordPressContext)
+- Vanilla JavaScript renderer for non-React applications
+- WordPress context management with separate API (setWordPressContext)
+- Plugin system via register() method for custom toolbar nodes
+- Configurable positioning (top/bottom) and theming (light/dark/auto)
+- Minimal base styles for full developer control
+- TypeScript support with complete type definitions
+- CSS exports for styling integration
+
+[0.1.0]: https://github.com/wpengine/hwptoolkit/releases/tag/toolbar-v0.1.0

plugins/hwp-cli/CHANGELOG.md

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+# Changelog
+
+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).
+
+## [0.1.0] - 2025-01-09
+
+### Added
+- Initial release
+- REST API endpoint `/wp-json/hwp/v1/cli/status` for system status checks
+- REST API endpoint `/wp-json/hwp/v1/cli/plugins` for HWP plugin discovery
+- Admin menu integration under Tools > HWP CLI
+- Environment information (WordPress version, environment type, debug status)
+- Plugin detection for HWP-prefixed plugins
+
+[0.1.0]: https://github.com/wpengine/hwptoolkit/releases/tag/hwp-cli-v0.1.0

plugins/hwp-cors-local/CHANGELOG.md

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+# Changelog
+
+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).
+
+## [0.1.0] - 2025-01-09
+
+### Added
+- Initial release
+- CORS header management for local headless WordPress development
+- Configurable frontend origins via HEADLESS_FRONTEND_URL constant
+- Automatic preflight OPTIONS request handling
+- Support for credentials, custom headers, and multiple HTTP methods
+- Environment-aware activation (local development only)
+- Security-first design preventing production activation
+
+[0.1.0]: https://github.com/wpengine/hwptoolkit/releases/tag/hwp-cors-local-v0.1.0

plugins/hwp-frontend-links/CHANGELOG.md

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+# Changelog
+
+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).
+
+## [0.1.0] - 2025-01-09
+
+### Added
+- Initial release
+- "View on Frontend" links in WordPress admin bar
+- Row action links in post/page lists
+- Support for single frontend configuration via HEADLESS_FRONTEND_URL
+- Support for multiple frontends via HWP_FRONTEND_LINKS constant
+- Filterable post path generation via hwp_frontend_links_post_path hook
+- Automatic link generation for singular post/page views
+- Security attributes (target="_blank", rel="noopener noreferrer")
+
+[0.1.0]: https://github.com/wpengine/hwptoolkit/releases/tag/hwp-frontend-links-v0.1.0

plugins/hwp-wp-env-helpers/CHANGELOG.md

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+# Changelog
+
+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).
+
+## [0.1.0] - 2025-01-09
+
+### Added
+- Initial release
+- Automatic REST API URL format conversion for wp-env compatibility
+- Forces ?rest_route= query parameter format to avoid .htaccess issues
+- Environment-aware activation (local development only)
+- Seamless integration with wp-env Docker environments
+
+[0.1.0]: https://github.com/wpengine/hwptoolkit/releases/tag/hwp-wp-env-helpers-v0.1.0