Appends String createdBy to the Deployment record (after createdAt), updates
both with-er methods to pass it through, threads the parameter through
DeploymentRepository.create, DeploymentService.createDeployment/promote, and
PostgresDeploymentRepository (INSERT + SELECT_COLS + mapRow). DeploymentController
passes null as placeholder (Task 4 will resolve from SecurityContextHolder).
Covers with PostgresDeploymentRepositoryCreatedByIT verifying round-trip via
both createDeployment and promote.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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