Attempt at building a platformio version before starting on changes to testing

pio_main.cpp

@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright (c) 2012-2024 Scott Penrose <scottp@dd.com.au> and WII5 Buoy contributors
+//
+// This file is part of WII5 Buoy firmware.
+// See LICENSE for full terms.
+
+/**
+ * @file pio_main.cpp
+ * @brief PlatformIO entry shim.
+ *
+ * PlatformIO only auto-detects a sketch (`*.ino`) at the top level of its
+ * source directory, but this project's sketch lives at
+ * `app/wii5_buoy/wii5_buoy.ino`. This shim pulls that sketch into the
+ * PlatformIO build (where `setup()`/`loop()` are defined).
+ *
+ * It is gated on the `PLATFORMIO` macro (defined only by PlatformIO) so that
+ * the arduino-cli build — which compiles the repo root as a flat library and
+ * the .ino as the sketch — never sees a second definition of setup()/loop().
+ */
+
+#if defined(PLATFORMIO)
+#include "app/wii5_buoy/wii5_buoy.ino"
+#endif