docs(changelog): update for v3.0.1 release

- convert Unreleased section to v3.0.1
- add recent changes: logo, tests, type annotations
- document pyright fixes and CI improvements
- set release date to 2025-07-25

CHANGELOG.md

@@ -7,13 +7,26 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [v3.0.1] - 2025-07-25
+
 ### Added
 
 - Add project logo in SVG and WEBP formats
+- Add additional metadata processing tests
+- Add type annotations for better IDE support and static type checking
 
 ### Changed
 
 - Use logo in documentation and README
+- Remove unnecessary TYPE_CHECKING usage in favor of direct imports
+- Improve sphinx-multiversion configuration for better CI documentation building
+
+### Fixed
+
+- Fix pyright type checking errors across processing and validation modules
+- Fix CI sphinx-multiversion tag detection issue
+- Fix is_doi return type validation
+- Restore missing demo image from v3.0.0 release
 
 ## [v3.0.0] - 2025-07-22