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>

leds/colors.py

@@ -7,6 +7,20 @@ from typing import Tuple
 
 RGB = Tuple[int, int, int]
 
+# Logical RGB (R, G, B) — same as neopixel: RED=(255,0,0), GREEN=(0,255,0), etc.
+# Firmware and Pi SPI convert to GRB on the wire (NeoPixel default pixel_order).
+RED: RGB = (255, 0, 0)
+GREEN: RGB = (0, 255, 0)
+BLUE: RGB = (0, 0, 255)
+WHITE: RGB = (255, 255, 255)
+OFF: RGB = (0, 0, 0)
+
+RGB_CYCLE: tuple[tuple[str, RGB], ...] = (
+    ("RED", RED),
+    ("GREEN", GREEN),
+    ("BLUE", BLUE),
+)
+
 
 def wheel(pos: int) -> RGB:
     pos = pos % 256