Appends DeploymentConfigSnapshot deployedConfigSnapshot to the Deployment record and adds a matching withDeployedConfigSnapshot wither. All positional call sites (repository mapper, test fixture) updated to pass null; Task 1.4 will wire real persistence and Task 1.5 will populate the field on RUNNING transition. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>