Restore release version 2.5.1

[pedrohcgs]

Summary

• Restore DESCRIPTION from development version 2.5.1.1 to release version 2.5.1.
• Keep the package on the published 2.5.1 release line.

Cause

PR #271 was a release-site update but did not carry the repository's release label. The post-merge workflow therefore treated it as a regular development PR and created a separate version-bump commit.

Safety

This PR changes only the Version: field in DESCRIPTION. It carries the release label so the post-merge development-version workflow will skip it.

Validation

• Parsed DESCRIPTION successfully.
• Confirmed the exact version is 2.5.1.
• Confirmed the diff contains one changed line in one file.
• git diff --check passes.

[Copilot]

Pull request overview

This PR restores the R package metadata version in DESCRIPTION from a development suffix (2.5.1.1) back to the published release line (2.5.1), aligning the repository’s declared version with the intended release state.

Changes:

• Update Version: in DESCRIPTION from 2.5.1.1 to 2.5.1.

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