Mutation-core: A mutation testing tool for Bitcoin Core

The mentioned GitHub repositories for Corecheck, named mutation-worker and chernobyl, are archived and no longer updated, which can imply that the project is either discontinued or paused. The URLs provided, mutation-worker and chernobyl, suggest that these were once active parts of the Corecheck suite or project, potentially offering functionalities or services pertinent to its overarching goals. However, without recent updates, their current relevance or utility might be limited, indicating a possible shift in development focus or cessation of activity within the Corecheck initiative.