Expand description
On-disk config: ~/.config/runtime/config.json.
The file holds the host URL, username, and PAT minted via
runtime auth login. The PAT is the only secret on the filesystem;
file mode is clamped to 0600 on Unix. Callers that want to point
the CLI at a different file (tests, sandboxes) set
RUNTIME_CONFIG_HOME to override the parent directory.