fix(ci): bump to v2.28.1 — fix npm publish workflow (#15)

* fix(ci): add --allow-same-version to npm publish workflow

npm version fails when package.json already matches the release tag.
Adding --allow-same-version prevents the error.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix(ci): bump to v2.28.1 — fix npm publish workflow

Added --allow-same-version to npm version command to prevent CI failure
when package.json already matches the release tag.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>