chore: add .gitignore for Go project

Exclude build artifacts, binaries, IDE files, and temporary files
from version control.

.gitignore

@@ -1,6 +1,43 @@
+# Node.js
 node_modules/
 .next/
 dist/
-.DS_Store
 .env
 .env.*
+
+# Binaries
+bin/
+controltower
+
+# Build artifacts
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary
+*.test
+
+# Output of the go coverage tool
+*.out
+
+# Go workspace file
+go.work
+
+# Build cache
+.cache/
+
+# IDE files
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Temporary files
+CHANGES_SUMMARY.sh