The run-once step of ADR 0052 reuses a module's runtime image but must run
its bootstrap/seed entrypoint offline and exit, not the broker-bound serve
loop. Add 'mesh-tools run <entrypoint>': import the compiled entrypoint,
await its top-level work, exit — no broker, so a first-boot seed runs before
the module has anything to talk to. Exit code is the step's, which is how the
host gates the container that depends on it.
Claude-Session: https://claude.ai/code/session_01LrgweAeERJYBg88c5cKDzF
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