• Fix refine-existing-codebase gauntlet task setup
    • Analyzed issue #99 where setupContainer failed due to missing /project directory and flake.nix
    • Identified that nix develop commands require a flake.nix file in the working directory
    • Modified setupContainer to create /project directory using mkdir -p /project
    • Added comprehensive flake.nix creation with all required tools (bun, jq, sed, python+requests, curl, which, hugo)
    • Preserved existing server.js creation logic exactly as before
    • Verified fix with comprehensive testing - all tests continue to pass
    • Ensured minimal, surgical changes with no impact on other gauntlet tasks
    • Made refine-existing-codebase task self-sufficient and no longer dependent on create-project-dir task