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

.gitignore

@@ -0,0 +1,22 @@
+# Rust build output
+/target/
+**/*.rs.bk
+
+# Cargo lock is committed for binaries (not libraries)
+# Cargo.lock is tracked
+
+# IDE
+.idea/
+*.iml
+.vscode/.history/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+Desktop.ini
+
+# Test artifacts
+/tests/tmp/