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What this changes

Every release now carries a third asset, Lantern-mac-arm64.zip, a byte-identical copy of the signed and notarized Lantern-mac.zip. The updater service update.electronjs.org files a darwin zip under darwin-arm64 only when its name contains -arm64, so until now Apple silicon got a 404. The Lantern-mac.zip download link is unchanged.

Key files

• .github/workflows/release.yml — new publish-job step before the release is created: fails if release-assets/Lantern-mac.zip is missing, then copies it to Lantern-mac-arm64.zip; the existing release-assets/* --clobber upload picks it up. No second build or signing.
• test/release-workflow.test.ts — parsed-YAML guards: the copy step exists, runs before the upload and fails on a missing source; upload is the whole folder with --clobber; the two build artifacts keep their names; the publish job builds, signs and reads no secret.
• README.md, docs/installation.md — state the extra file and that the Lantern-mac.zip link stays the one to use.

Before / after

Before: release assets Lantern-mac.zip, Lantern-win-x64.zip; /darwin-arm64/<version> answers 404.
After: Lantern-mac.zip, Lantern-mac-arm64.zip, Lantern-win-x64.zip. Rule checked in electron/update.electronjs.org src/asset-platform.ts: /.*-(mac|darwin|osx).*\.zip$/i plus /-arm64/ gives DARWIN_ARM64, else x64.

Verified with pnpm run typecheck, pnpm run lint, pnpm test, all green. The release workflow itself was not run (it needs a real tag). Unreviewed fixes: none. Lantern: 2 files re-mapped.

Run cost

agent	model	effort	calls	cache-read	cache-write+input
lantern-delegate-medium	sonnet 5.5	medium	59	8701794	159953
└ reviewer ×1	opus 5.5	medium	10	510601	77480
total			69	9212395	237433

🤖 Generated with Claude Code