fix(release): align filesystem worker smoke protocol

[jackwener]

Summary

• make the packaged macOS filesystem-worker smoke use the protocol version exported by the built runtime instead of a duplicated hardcoded value
• add a regression test that captures the packaged-worker request and verifies it stays aligned with the runtime protocol

This fixes the Verify the final DMG failure in release run #31318321465, where the verifier sent protocol v4 after #2532 upgraded the worker to v5.

After merge, rerun the Release desktop workflow from main for v0.1.9.

Verification

• node --test scripts/macos-arm64-release.test.mjs (3/3 passed)
• git diff --check

A clean npm ci --ignore-scripts was attempted but the registry connection reset while fetching dependencies. The focused test was run against the built protocol module after TypeScript emitted it.