Add a single-step molecule for building and installing the gt binary. The molecule contains one step: - install: Build with `go build -o gt ./cmd/gt` and install with `go install ./cmd/gt` Added InstallGoBinaryMolecule() function and test. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>