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Install only updates signed with the release key - #78
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CI signs SHA256SUMS.txt together with the release tag using an ed25519 key from the RELEASE_SIGNING_KEY secret, and checks it against the key built into the app. The app installs only a Syncer.exe whose hash is in a validly signed sums file of a newer release, and never while a backup or an account change is running.
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Task 8 of docs/design/safety-fixes-2026-10.md. Updates used to install whatever Syncer.exe the latest release had, so anyone who could change a release asset could ship code to every PC. Now CI signs SHA256SUMS.txt (with the tag) using the RELEASE_SIGNING_KEY secret, and the app only installs an exe whose hash is in a sums file signed with the embedded key. An unsigned release, a hash mismatch or an older tag is reported and never installed. Updates also wait while a backup or account switch is running.