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- apko release assets use lowercase OS and Go arch naming (linux_amd64), but uname returns Linux and x86_64. Map with tr/sed before building the download URL. - Flutter release check used curl -fsSL which fails on 404 when the release doesn't exist yet. Switch to -sS so the step continues and correctly detects new versions. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>