Add Pico presets engine, patterns, and tests.

Wire the Pico to UART-driven preset selection, add pattern modules and presets data, remove old p2p/settings code, and update tests and LED driver.

Made-with: Cursor

pico/src/patterns/test.py

@@ -0,0 +1,28 @@
+"""Test pattern: strip i has (i+1) LEDs on at the start (indices 0..i) plus the midpoint LED on. 50% red."""
+
+BRIGHTNESS = 0.50
+
+RED = (255, 0, 0)
+
+
+def _scale(color, factor):
+    return tuple(int(c * factor) for c in color)
+
+
+class Test:
+    def __init__(self, driver):
+        self.driver = driver
+
+    def run(self, preset):
+        strips = self.driver.strips
+        red = _scale(RED, BRIGHTNESS)
+        for strip_idx, strip in enumerate(strips):
+            n = strip.num_leds
+            mid = self.driver.strip_midpoints[strip_idx]  # from STRIP_CONFIG
+            strip.fill((0, 0, 0))
+            # First (strip_idx + 1) LEDs on: indices 0..strip_idx
+            for i in range(min(strip_idx + 1, n)):
+                strip.set(i, red)
+            # Midpoint LED on
+            strip.set(mid, red)
+            strip.show()