GitHub Codespaces Efficiency Use this skill as a lean entrypoint for GitHub Codespaces efficiency work. Inspect the repo, identify waste, and load only needed references. If no exists yet, load and define a baseline before proceeding with the steps below. Use This Skill When - The user wants faster Codespaces startup or lower Codespaces spend. - The repo has a or explicit Codespaces configuration questions. - The user asks for devcontainer optimization, machine sizing, prebuild strategy, or idle-timeout guidance. - The user is setting up Codespaces for the first time or needs help creating a…