HEY skill should reuse stored authentication for unattended agents

[wgj]

The bundled SKILL.md currently tells agents to run hey auth login before all data commands. This unnecessarily launches browser OAuth, even when valid stored credentials are already available, which breaks unattended tasks.

Suggested behavior:

• Run hey auth status --json.
• If authenticated, proceed. The CLI can refresh expiring tokens automatically.
• If authentication fails during an unattended task, report it as blocked rather than launching a browser.
• Use hey auth login only for interactive recovery when the user is present.

[robzolkos]

Fixed by #366. The bundled HEY skill now tells agents to reuse stored credentials, run data commands without a login preflight, and reserve hey auth login for interactive recovery. It also documents HEY_NONINTERACTIVE=1 for unattended sessions running under a PTY.

Managed skill copies will refresh automatically when the next hey-cli release runs.