The composer answers the assigner's composition step: the request is read from the file named by MESH_RUN_INPUT and the verdict is the last line of standard output, exit 0; the compose-job path stays. Builds: design 47 G §354, §63, §22; lead answer A-167 Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h