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/test/mocks/mock_hal.h

@@ -0,0 +1,45 @@
+#ifndef MOCK_HAL_H
+#define MOCK_HAL_H
+
+#include <gmock/gmock.h>
+#include "hal.h"
+
+/*
+ * StrictMock-friendly HAL mock for unit tests.
+ *
+ * Use this when you want to verify exact call sequences:
+ *   EXPECT_CALL(mock, digitalWrite(13, HIGH)).Times(1);
+ */
+class MockHal : public Hal {
+public:
+    // GPIO
+    MOCK_METHOD(void, pinMode, (uint8_t pin, uint8_t mode), (override));
+    MOCK_METHOD(void, digitalWrite, (uint8_t pin, uint8_t value), (override));
+    MOCK_METHOD(uint8_t, digitalRead, (uint8_t pin), (override));
+    MOCK_METHOD(int, analogRead, (uint8_t pin), (override));
+    MOCK_METHOD(void, analogWrite, (uint8_t pin, int value), (override));
+
+    // Timing
+    MOCK_METHOD(unsigned long, millis, (), (override));
+    MOCK_METHOD(unsigned long, micros, (), (override));
+    MOCK_METHOD(void, delay, (unsigned long ms), (override));
+    MOCK_METHOD(void, delayMicroseconds, (unsigned long us), (override));
+
+    // Serial
+    MOCK_METHOD(void, serialBegin, (unsigned long baud), (override));
+    MOCK_METHOD(void, serialPrint, (const char* msg), (override));
+    MOCK_METHOD(void, serialPrintln, (const char* msg), (override));
+    MOCK_METHOD(int, serialAvailable, (), (override));
+    MOCK_METHOD(int, serialRead, (), (override));
+
+    // I2C
+    MOCK_METHOD(void, i2cBegin, (), (override));
+    MOCK_METHOD(void, i2cBeginTransmission, (uint8_t addr), (override));
+    MOCK_METHOD(size_t, i2cWrite, (uint8_t data), (override));
+    MOCK_METHOD(uint8_t, i2cEndTransmission, (), (override));
+    MOCK_METHOD(uint8_t, i2cRequestFrom, (uint8_t addr, uint8_t count), (override));
+    MOCK_METHOD(int, i2cAvailable, (), (override));
+    MOCK_METHOD(int, i2cRead, (), (override));
+};
+
+#endif // MOCK_HAL_H