Allow manual npm publish workflow runs

[sf-jin-ku]

Summary

• add workflow_dispatch to the npm publish workflow
• allow a ref input so publish can be retried from the chosen git ref without recreating the release

Testing

• ruby -e 'require "yaml"; YAML.load_file(".github/workflows/publish.yml"); puts "ok"'
• git diff --check -- .github/workflows/publish.yml

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Honor selected workflow ref before defaulting to main

For workflow_dispatch runs, inputs.ref has a default (main), so this expression resolves to main whenever the input is left as-is, even if the run was started from a tag/branch in the Actions UI. In a publish workflow, that can cause a manual retry intended for a release tag to publish code from main instead. Reorder/fence this fallback so the selected run ref is used unless an explicit override was provided.

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