The kubernetes plugin fix worked — agent connected, checkout succeeded, pipeline ran through 3 stages. Next failure: loadConfig.groovy calls readYaml (to parse config.yaml), but that step isn't in the chart's default plugin list at all, so it was never installed: "No such DSL method 'readYaml' found among steps [...]". Adds pipeline-utility-steps, which provides readYaml/writeYaml/ readJSON etc.