Sub-ticket of MSG-187 Design + LIVE-TEST ca.sh: reads ca= from .agent-name, codex --dangerously-bypass-approvals-and-sandbox, injects -c mcp_servers.llmmsg-srv.env.LLMMSG_AGENT_NAME + LLMMSG_HUB_URL; PROVE shim auto-registers under ca name (roster check) before calling done · llmmsg-srv