Add emoji icons to task tool description field for squad member spawns #73

When Squad spawns agents via the task tool, the description parameter currently uses plain text like Fenster: refactoring auth module but the launch table shows emoji like 🔧 Fenster — refactoring auth module. Adding emoji to the description field makes the UI task list visually consistent and easier to scan.

Emoji confirmed working in description field (unicode chars, within 100-char limit).

Update all description patterns in squad.agent.md spawn templates to include role-based emoji prefix.