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>

go.mod

@@ -0,0 +1,10 @@
+module github.com/kisom/sgard
+
+go 1.25.7
+
+require (
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/spf13/cobra v1.10.2 // indirect
+	github.com/spf13/pflag v1.0.9 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)