- Build complete Three.js scene with stars, fog, grid and portal rings
loaded from portals.json
- Each portal has a canvas-rendered holographic sign showing name,
description and status, colour-matched to the portal colour
- Signs float up/down, pulse opacity, and have a drifting scanline
overlay for a holographic look
- Portal rings spin slowly; point lights pulse intensity in sync
- Vertical connecting beam links each sign to its portal ring
- Full HTML with Three.js import map (v0.183), HUD elements, CSS design
system with dark-space theme and CSS variables
Fixes#108