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## [0.4.0] - 2026-02-01
### Added
* Extensible signature method registry allowing custom signature methods to be registered at runtime
* Support for RSA-SHA256 and HMAC-SHA256 signature methods
* OAuth Request Body Hash support (`oauth_body_hash` parameter) for signing requests with non-form-encoded bodies
* Support for parsing OAuth credentials from POST body via `Header.parse_form_body`
* Support for `realm` parameter in OAuth Authorization header
### Fixed
* Avoid symbolizing untrusted input in parse methods for security
* Refactored `Header.parse` for improved robustness using StringScanner
### Changed
* Supports Ruby 3.2, 3.3, 3.4, and 4.0
* Added `base64` and `cgi` as explicit runtime dependencies
* Migrated test suite from RSpec to Minitest
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