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/preset.py

@@ -12,6 +12,8 @@ class Preset:
         self.n4 = 0
         self.n5 = 0
         self.n6 = 0
+        self.n7 = 0
+        self.n8 = 0
 
         # Override defaults with provided data
         self.edit(data)
@@ -76,4 +78,6 @@ class Preset:
             "n4": self.n4,
             "n5": self.n5,
             "n6": self.n6,
+            "n7": self.n7,
+            "n8": self.n8,
         }