Reads and writes Fleet's runtime settings, stored in the SQLite settings table — not in .fleet/config.yaml. Use get/set/list for individual settings, validate to check a repo's .fleet/config.yaml, and export/import/snapshot/rollback/diff to manage config snapshots.
Unknown setting keys are rejected up front so a typo can't silently persist a dead row. All config output is JSON; there is no --json flag and no --org flag.