fix(release): verify CLI architectures with Xcode 27

[ajbeck]

Summary

• verify the packaged CLI arm64 and x86_64 slices in separate lipo invocations
• avoid Xcode 27 beta rejecting a multi-architecture -verify_arch command
• report the exact missing architecture if verification fails

The failed v0.5.2 archive log confirms that Xcode linked both arm64 and x86_64 binaries and created a universal CLI. The failure occurred only when the verification command supplied both architectures at once.

Verification

• reproduced the combined-command failure with Xcode 27 build 27A5252f
• verified individual arm64 and x86_64 checks with the Xcode 27 lipo tool
• actionlint .github/workflows/release.yml
• git diff --check

Release follow-up

After merging, manually run the Release workflow with release_tag set to v0.5.2 to package and upload the missing release assets.