Publish article theme from LightconeResearch

[lhparker1]

Summary

• Publish article-theme build artifacts to LightconeResearch/astra-article-theme.
• Update the source README to use the organization-owned article-theme URL.

Why

The source theme already lives under LightconeResearch, but its generated public article bundle is currently owned by a personal account. Keeping the distribution repository under the organization makes ownership and downstream configuration consistent while preserving the existing source/build separation.

Impact

On the next tagged release, the publishing workflow will force-update main and the release tag in LightconeResearch/astra-article-theme. Book-theme publishing remains unchanged.

Validation

• Parsed .github/workflows/publish-theme.yml with the repository's installed YAML parser.
• git diff --check

Required before merge

• Transfer or create the public LightconeResearch/astra-article-theme repository. Transferring the existing repository is preferable because it preserves tags, history, and GitHub redirects.
• Grant the DEPLOY_TOKEN fine-grained token Contents read/write access to the organization repository.
• Confirm the new public bundle is available before changing downstream consumers.

[lhparker1]

Closing as part of the astra-theme consolidation around #7. Organization-owned publishing can be reopened as a focused follow-up when the distribution repository and credentials are ready.