Step 1: Replace C++ prototype with Go project scaffolding.

Remove all old C++ source files, proto definitions, CMake build,
clang configs, IDE files, and Trunk linter config. Initialize Go
module (github.com/kisom/sgard) with cobra and yaml.v3 deps.
Set up cobra root command with --repo persistent flag.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitignore

@@ -1,5 +1 @@
-*.o
-
-build
-cmake-build-*
-sgard
+/sgard