Add portal web simulator, SPI bridges, and Pico firmware updates.

Bring the five-panel hex portal online with a browser 3D/schematic preview, Pi SPI backends, and renamed multi-panel Pico UDP firmware.

Co-authored-by: Cursor <cursoragent@cursor.com>

examples/panel_spi_bridge.py

@@ -0,0 +1,9 @@
+#!/usr/bin/env python3
+"""Run a UDP-to-SPI bridge so a Pi-connected panel looks like a Pico adapter."""
+
+from __future__ import annotations
+
+from leds.panel_bridge import main
+
+if __name__ == "__main__":
+    raise SystemExit(main())