v3.0.0

The 3.0.x series is considered a development release while the protocol HTTP application and controller interfaces stabilize.

• Breaking Require Ruby 3.3 or later.
• Breaking Replace the Rack-centric application boundary with {ruby Utopia::Application} and {ruby Protocol::HTTP::Middleware}. Applications now use config/application.rb and config/serve.rb instead of config.ru.
• Breaking Separate complete protocol responses from semantic controller results. Use respond! with a {ruby Protocol::HTTP::Response}, or succeed! with a value serialized by {ruby Utopia::Controller::Respond}.
• Parse request bodies at the controller layer using protocol-content, independently of URL query parameters.
• Resolve localization through immutable request preferences, avoiding repeated internal controller requests.
• Split redirection handling into focused middleware for rewrites, moved resources, directory indexes, and error documents.
• Security Fix handling of redirects that start with // to prevent open redirect vulnerabilities.
• Normalize request URLs using Protocol::URL and use structured paths throughout the middleware stack.
• Resolve static files through encoded URL paths, with improved HEAD, range, and validator handling.
• Use protocol-media and protocol-http for response and language negotiation, removing the http-accept dependency.