Non-prerelease promote failure

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This PR fixes an issue where the promote workflow job would fail on fresh non-prerelease publishes. The promote job, triggered by the released event, often ran before the deploy job had published the package to npm, causing npm dist-tag add to error on a non-existent version.

The change adds a check to ensure the package version exists on npm before attempting to add the latest dist-tag. This prevents the promote job from failing prematurely and ensures it only proceeds when the package is available.

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[cursor]

Automatically closed this PR because it was created by Bugbot autofix for #71, and that PR was closed.