[Mike Hamanaka (hamanakam1)]

Verify executable permissions in the published macOS prebuilds

Summary

Add a packaging regression check that inspects the actual npm tarball produced by the publish and test pipelines and fails unless both macOS spawn-helper binaries retain executable permissions.

Problem

The spawn-helper files in the macOS prebuilds must be executable because node-pty invokes them through posix_spawn. A published tarball can contain the files with mode 0644 even when the local build output was executable. That produces posix_spawnp failed at runtime, particularly for package-manager workflows that preserve the tarball's file modes.

An install-time chmod is not a complete fix because package managers may skip lifecycle scripts. The invariant must be checked at package creation time.

Change

After the pipeline's existing chmod +x prebuilds/darwin-*/spawn-helper step, run npm pack --ignore-scripts, inspect the resulting tarball with tar -tvf, and require executable mode (-rwxr-xr-x) for both macOS prebuild helpers.

The check is present in both buildSteps and testSteps so packaging regressions fail before publication and remain covered by the normal test path.

Why this approach

• It validates the artifact users actually install, not only the checkout.
• It preserves the existing pipeline fix rather than adding a lifecycle-script dependency.
• It covers both macOS architectures included in the package.
• It emits the observed spawn-helper entries when the assertion fails.
• It does not alter runtime behavior or add a production dependency.

Validation

• ruby -e 'require "yaml"; YAML.load_file("publish.yml")'
• git diff --check
• npm ci
• npm test — 24 passing; lint passed via posttest

The local source checkout does not contain the pipeline-downloaded prebuilds/ artifacts, so the package assertion itself is intended to execute in the Azure publish/test jobs after those artifacts are downloaded.

Scope

This change does not publish a package, modify the upstream repository, or change the runtime helper path. It only makes the existing packaging invariant enforceable.

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