Something does not work. How do I diagnose it?
Run `frely doctor` to check sign-in, installation, the latest version, MCP and service state. Add -v for config paths, authorization expiry, last heartbeat and sanitized errors. If the device shows offline, run `frely mcp start`, which is safe to re-run. If the problem remains, ask in Discord or open a GitHub issue with the `frely doctor -v` output.