#156 changes src/run-agent.sh and src/load-contracts.sh, which are baked into the worker image. Its run-agent.sh refuses to start unless the launcher sets MOSAIC_SYSTEM_PROMPT_FILE, and no launcher before #156 does. Rebuilding the shared 0.0.12 tag would break the live pinned copy and rollback targets, so the new image gets its own tag. No code change.