Replace retired macos-14 in verified npm release matrix #385

Problem

The verified npm worker release workflow added in #377 still includes runner: macos-14 in .github/workflows/code-package.yml (verify matrix, Node 24.22.1).

GitHub states all macOS 14 images retired from GitHub Actions on November 2, 2026:
https://github.com/actions/runner-images
https://github.blog/changelog/2026-10-01-github-actions-macos-14-runner-image-retirement/

A fresh run can therefore fail the macOS ARM matrix cell before tests start. publish requires verify, so that blocks npm publication through the verified release path. The previously green #377 run does not establish that this retired label remains available for future runs.

Suggested fix

Use a supported ARM label such as macos-15 for that cell, retaining macos-15-intel for Intel coverage. GitHub runner documentation lists macos-15 as ARM64:
https://docs.github.com/en/actions/reference/runners/github-hosted-runners

Run the pack/verify workflow after the change, with publication disabled, and confirm both macOS architectures validate the same packed artifact.

Evidence

The private fork storage CI independently received The configuration 'macos-14-arm64-us-default' is not supported. Switching that private root job to macos-15 passed. The imported public workflow remains unchanged in the fork; Bugbot identified this separate public release-matrix issue during sync review:
https://github.com/ClickHouse/ai/pull/4885#discussion_r4527653104