Validates and publishes the working draft of a workflow. On success (200) the new version becomes live and can accept runs. If the configuration fails validation the workflow is left unchanged and the call returns a 400 error whose message lists the problems — validation failures are not a 200 response. Beyond configuration validation, publish also returns a 400 when an ATS entry pathway names a job already connected to another workflow, campaign, or analysis (ATS_JOB_ALREADY_CONNECTED), or when automatic rubric generation for a screening node fails (RUBRIC_GENERATION_FAILED).