I just won an Honorable Mention at the **GitLab Duo Agent Platform Hackathon 2026** — a global competition with 6,971 participants and which has a total $65,000 prize pool — with a project called Carbon Tracker I won in Sustainable Agent Category Built it solo. In 5 days. With zero prior GitLab experience. This is the full story — what I built, why, how it works, and everything I learned. 🌍 The Problem Nobody Is Talking About I was reviewing a failed CI/CD pipeline when a thought hit me: This pipeline just retried 3 times. How much electricity did that waste? I searched for a tool that could answer that. Nothing existed. No GitLab feature. No third-party plugin. No open source project. Developers obsess over pipeline speed, test coverage, and code quality — but the carbon footprint of their CI/CD infrastructure is completely invisible.…