1.9.0

• Add CompileStepInterface — compile-phase vocabulary for renderer modules; madapaja/twig-module and bear/qiq-module are waiting on this release
• Handle JsonSchemaRequestException as 400 Bad Request in ThrowableHandler; schema validation failure is a client error, not a 500
• Require bear/resource ^1.33 for the JsonSchema exceptions
• Remove dead public properties VndError::$headers / $body — the error response lives in the internal ErrorPage (BC break for code reading them)
• CI on PHP 8.5