arctl version errors noisily when daemon is not running

[tjorourke]

Summary

Running arctl version when the daemon is not running produces a confusing error that looks like a failure, even though the user just wants to check the CLI version.

Steps to reproduce

# With daemon not running
arctl version

Current output

arctl version v0.3.3
Git commit: 89dc215
Build date: 2026-04-02
Error getting server version: Get "http://localhost:12121/v0/version": dial tcp [::1]:12121: connect: connection refused

Expected behaviour

One of:

1. version should only show the CLI version — server version is a separate concern. A arctl daemon status or arctl version --server flag could optionally fetch it.
2. Or auto-start the daemon — if arctl always requires the daemon, start it transparently on any command (similar to how Docker Desktop handles the daemon).
3. Or show a clear hint — if the daemon check fails, print Daemon not running — start it with: arctl daemon start instead of a raw connection error.

Why this matters

Users hitting this for the first time (e.g. from install scripts) see connection refused and assume something is broken. The CLI version check is a natural first step after install — it should always succeed cleanly.

Environment

• arctl v0.3.3
• macOS Darwin 25.3.0