fruxon-agent-mode

The fruxon CLI's machine contract: what its exit codes (2, 10-16) mean, the {"error":{...}} envelope on stderr, commands that refuse without --yes (exit 16), and the JSON / NDJSON shapes that agents draft run, agents sandbox stream, agents sandbox test, and agents tests watch emit. Load when a fruxon command fails or refuses, when you need to parse one of those streams, or when scripting the CLI from CI.