LorenEteval_Furious/Furious/Backends/ExternalCore/AGENTS.md

External Core guidance

• This backend is protocol-agnostic. Keep executable, working directory, argument vector, environment, proxy endpoints, shutdown timeout, and application-tun2socks choice as distinct fields; preserve unknown top-level fields.
• Execute with shell=False, own the exact Popen plus readers/watchers, and terminate/kill/reap it within the configured shutdown contract. Never concatenate a shell command or log environment secrets.
• Application tun2socks is explicit and requires a valid remote address; this backend never invents a native core TUN.
• Verify mapping/unknown-field round trips, mocked spawn/start/stop failures, output-reader cleanup, TUN validation, and repeated editor/validation-dialog destruction.