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/_dot_vscode/settings.json

@@ -0,0 +1,21 @@
+{
+    "files.associations": {
+        "*.ino": "cpp",
+        "*.h": "cpp"
+    },
+    "C_Cpp.default.includePath": [
+        "${workspaceFolder}/lib/hal",
+        "${workspaceFolder}/lib/app"
+    ],
+    "C_Cpp.default.defines": [
+        "LED_BUILTIN=13",
+        "INPUT=0x0",
+        "OUTPUT=0x1",
+        "INPUT_PULLUP=0x2",
+        "LOW=0x0",
+        "HIGH=0x1"
+    ],
+    "editor.formatOnSave": false,
+    "files.trimTrailingWhitespace": true,
+    "files.insertFinalNewline": true
+}