Use RuntimeInformation.OSDescription for OS version display

[Copilot]

The --validate command displayed OS version as "Unix 6.11.0.1018" instead of a human-readable description like "Ubuntu 22.04.5 LTS".

Changes

• Replaced Environment.OSVersion.VersionString with RuntimeInformation.OSDescription in Validate.cs
• Added System.Runtime.InteropServices using statement

Before/After

| OS Version          | Unix 6.11.0.1018                                   |

| OS Version          | Ubuntu 24.04.3 LTS                                 |

RuntimeInformation.OSDescription returns the distribution-specific description on Linux systems rather than just the kernel platform identifier.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Validate OS Listing is incorrect</issue_title>
<issue_description>When I run the --validate, I get

| Information     | Value                                    |

| :-------------- | :--------------------------------------- |

| Sha256 Version   | 0.3.0                                    |

| Machine Name    | mybox-u2204                              |

| OS Version      | Unix 6.8.0.85                            |

| DotNet Runtime  | 8.0.20                                   |

| Time Stamp      | 2025-10-14 13:18:25Z                     |

When I would have expected the OS version to read as either "Linux 6.8.0.85", the output of lsb_release -d -s "Ubuntu 22.04.5 LTS", or a combination of the two.
</issue_description>

<agent_instructions>Please research this issue and determine if there's a way to provide a more human-friendly OS Version such as is described in the ticket comments.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Validate OS Listing is incorrect #82

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