Release workflow race

[cursor]

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• I've updated this PR with the latest code from main
• I've done a cursory QA pass of my code locally
• I've ensured all automated status check and tests pass
• I've connected this PR to an issue

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• I've written a unit or functional test for my code
• I've updated relevant documentation it my code changes it
• I've updated this repo's README if my code changes it
• I've updated this repo's CHANGELOG with my change unless its a trivial change (like updating a typo in the docs)

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• I've requested a review with relevant people

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This PR fixes a race condition where the promote job would fail during a fresh non-prerelease publication. Previously, the promote job would attempt to add the latest dist-tag before the deploy job had finished publishing the package to npm, causing an error.

The fix introduces a check to verify if the package version already exists on npm before attempting to add the latest dist-tag. This ensures that the promote job only acts on existing prereleases and avoids failing on new releases, preventing misleading workflow failures.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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[cursor]

Automatically closed this PR because it was created by Bugbot autofix for #66, and that PR was closed.