docs: update changelog for versions 0.3.0 through 0.6.0

Author: root

CHANGELOG.md

@@ -2,7 +2,39 @@
 
 All notable changes to this project will be documented in this file.
 
-## [0.2.0] - 2026-01-29
+## [0.6.0] - 2026-03-13
+### Added
+- Path traversal protection with Unicode normalization
+- Argon2 key derivation for enhanced security
+- Rate limiting for decryption operations
+- Internal `sanitize_file_path_internal` for test compatibility
+
+### Fixed
+- Removed unused `TooManyAttempts` variant from `RateLimitError`
+- Dead code cleanup in test files
+- Clippy warnings and formatting issues
+
+## [0.5.0] - 2026-03-13
+### Security
+- Enhanced path sanitization to prevent directory traversal attacks
+- Improved error handling for security-critical operations
+
+## [0.4.0] - 2026-01-29
+### Added
+- Advanced validation rules for configuration values
+- Tamper-evident audit logging system with integrity checks
+- Sensitive value masking in audit logs
+
+### Fixed
+- Test race conditions in concurrent environments
+- Core module stability and error handling improvements
+
+## [0.3.0] - 2026-01-29
+### Added
+- New brand identity with a modern SVG logo and mascot
+- Comprehensive documentation suite (Guides, Components, Reference)
+
+## [0.2.0] - 2026-01-25
 ### Added
 - Advanced validation rules for configuration values.
 - Tamper-evident audit logging system with integrity checks.