Anvil v1.0.0 -- Arduino build tool with HAL and test scaffolding

Single-binary CLI that scaffolds testable Arduino projects, compiles,
uploads, and monitors serial output. Templates embed a hardware
abstraction layer, Google Mock infrastructure, and CMake-based host
tests so application logic can be verified without hardware.

Commands: new, doctor, setup, devices, build, upload, monitor
39 Rust tests (21 unit, 18 integration)
Cross-platform: Linux and Windows

templates/basic/__name__/__name__.ino.tmpl

@@ -0,0 +1,28 @@
+/*
+ * {{PROJECT_NAME}}.ino -- LED blink with button-controlled speed
+ *
+ * This .ino file is the entry point. All logic lives in the app
+ * header (lib/app/{{PROJECT_NAME}}_app.h) which depends on the HAL
+ * interface (lib/hal/hal.h), making it testable on the host.
+ *
+ * Wiring:
+ *   Pin 13 (LED_BUILTIN) -- onboard LED (no wiring needed)
+ *   Pin 2                -- momentary button to GND (uses INPUT_PULLUP)
+ *
+ * Serial: 115200 baud
+ *   Prints "FAST" or "SLOW" on button press.
+ */
+
+#include <hal_arduino.h>
+#include <{{PROJECT_NAME}}_app.h>
+
+static ArduinoHal hw;
+static BlinkApp app(&hw);
+
+void setup() {
+    app.begin();
+}
+
+void loop() {
+    app.update();
+}