Maintains SpecFlow tests on existing .NET projects - authors Gherkin `.feature` files, writes C# `[Binding]` step definitions, runs them via xUnit/NUnit/MsTest, and migrates a project to Reqnroll. SpecFlow is the legacy .NET BDD framework and Reqnroll is its maintained fork. Use only for existing SpecFlow projects, especially mid-migration; new .NET BDD projects use `reqnroll-testing` instead.