Fix release workflow: add missing tag_name to action-gh-release

[Copilot]

softprops/action-gh-release@v2 fails with ⚠️ GitHub Releases requires a tag because the workflow triggers on push to main, not on tag creation — so github.ref is refs/heads/main and the action cannot infer a tag.

• Add explicit tag_name: ${{ steps.version.outputs.version }} to the release step, using the version already computed upstream

- name: Create Release
  uses: softprops/action-gh-release@v2
  with:
    tag_name: ${{ steps.version.outputs.version }}
    name: ${{ steps.version.outputs.version }}

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