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Download files, release assets, or entire repositories (including submodules) from GitHub. Use whenever the user needs to fetch GitHub resources but direct connections are slow, timing out, rate-limited, or blocked — large release assets (ffmpeg builds, binaries, models), git clone with submodules, or single files. The skill auto-detects network problems, probes and benchmarks proxy mirrors, resumes interrupted downloads, verifies SHA-256 checksums, and extracts/installs artifacts. Make sure to use this skill whenever the user mentions downloading from GitHub, cloning a repo, fetching a release, getting a binary from GitHub, or any download that fails or stalls on GitHub — even if they don't explicitly ask for help with mirrors or proxies.