Add five floating holographic panels arranged in a 135° semi-circle
behind the platform, one per agent (claude, gemini, kimi, groq, grok).
Each panel shows agent name, status (working/idle/dead) with a colour-
coded dot, current issue title, and PRs merged today.
Status data is fetched from /api/status.json every 30 seconds; the
stub JSON is committed so the scene works without a live backend.
Panel sprites float gently via the existing animation loop.
Fixes#199
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
