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/test/test_serial.py

@@ -0,0 +1,45 @@
+#!/usr/bin/env python3
+"""
+Serial loopback test – single file, runs on Pico and ESP32.
+Wire TX to RX (Pico: GP0–GP1, ESP32: 17–18), then:
+  mpremote run pico/test/test_serial.py
+
+For ESP32→Pico: run test_serial_send.py on ESP32, test_serial_receive.py on Pico; wire ESP32 TX (17) to Pico RX (1).
+"""
+import time
+import sys
+from machine import UART, Pin
+
+if "esp32" in sys.platform:
+    UART_ID, TX_PIN, RX_PIN, BAUD = 1, 17, 18, 115200
+else:
+    UART_ID, TX_PIN, RX_PIN, BAUD = 0, 0, 1, 115200
+
+READ_TIMEOUT_MS = 100
+LINE_TERM = b"\n"
+
+print("UART loopback: %s UART%d TX=%s RX=%s %d baud" % (sys.platform, UART_ID, TX_PIN, RX_PIN, BAUD))
+uart = UART(UART_ID, baudrate=BAUD, tx=Pin(TX_PIN, Pin.OUT), rx=Pin(RX_PIN, Pin.IN))
+uart.read()
+to_send = [b"hello", b"123", b"{\"v\":\"1\"}"]
+errors = []
+for msg in to_send:
+    uart.write(msg + LINE_TERM)
+    time.sleep_ms(20)
+    buf = bytearray()
+    deadline = time.ticks_add(time.ticks_ms(), READ_TIMEOUT_MS)
+    while time.ticks_diff(deadline, time.ticks_ms()) > 0:
+        n = uart.any()
+        if n:
+            buf.extend(uart.read(n))
+        if LINE_TERM in buf:
+            break
+        time.sleep_ms(2)
+    got = bytes(buf).strip()
+    if got != msg:
+        errors.append((msg, got))
+uart.deinit()
+if errors:
+    print("FAIL loopback:", errors)
+else:
+    print("PASS loopback: sent and received", to_send)