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Address review on #482: drop the generic "credential boundary" framing in the PRD and docstrings and talk about the specific services — the orchestrator holds the control-plane key; the host controller (#468) gets a separate key the orchestrator never holds, so the orchestrator can't mint the credentials it uses to talk to the host controller that owns its lifecycle. Lead with that concrete win. No code behaviour change. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>