[asgarihope]

Summary

• Apple Silicon in-app update asks the Tauri updater for macos-aarch64. Release 6.2.74 uploaded the disk image, but latest.json only listed Linux and Windows, so Check/Install failed with "the platform macos-aarch64 was not found in the response platforms object".
• The macOS release job now signs BiFlow_<version>_aarch64.dmg with the existing updater key and publishes that signature as platforms["macos-aarch64"]. The key stays identical to signed_target for a DMG on aarch64.
• Version is 6.2.75 so the next push to main publishes a release whose manifest installed Apple Silicon builds can install. The already published 6.2.74 disk image has no signature, so that release cannot grow this platform after the fact.

Test plan

• node --test scripts/generate-latest-json.test.mjs asserts platforms["macos-aarch64"] points at BiFlow_<version>_aarch64.dmg and matches the Rust updater target
• scripts/build-plan.test.mjs requires the release workflow to sign the disk image and upload *.dmg.sig
• cargo test -p iran-split-desktop --lib github_update confirms the Apple Silicon target is macos-aarch64
• pnpm check, pnpm build, and cargo clippy -p iran-split-desktop --all-targets -- -D warnings
• After merge, confirm the 6.2.75 GitHub Release latest.json contains macos-aarch64 with a signature, then install the update from an older Apple Silicon build via About → Check for updates

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