test: add seed deployment handle_in tests (seed_status, seed_result)
Test deployment:seed_status updating seed deployment state,
deployment:seed_result recording results (with and without result
field for log-only updates), and error cases for unknown deployments
and seeds not in the deployment.
SOW-73
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>