Insight for: [Tracking] docs(readme): add prerequisites section and install verification step (was PR #3781 from fork)

This tracking issue addresses a fundamental user onboarding problem: inadequate installation documentation. The proposed changes—adding explicit prerequisites (Node.js, npm, Git), version checks, and an install verification step (`gsd-tools --help`)—directly reduce friction for new users. The current lack of clarity likely leads to failed installations and early user abandonment. By providing a clear, verifiable path to a working setup, the project improves its first-time user experience, a critical factor for adoption in developer tools. This is a low-cost, high-impact improvement that directly impacts user acquisition and retention by ensuring a smooth initial interaction.