docs: Update stale documentation - .github/skills/experimental/mural/tests/corpus/README.md

[github-actions]

Stale Documentation Detected

File: .github/skills/experimental/mural/tests/corpus/README.md
Current ms.date: 2026-04-24
Age: 94 days (threshold: 90 days)

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Workflow Run: https://github.com/microsoft/hve-core/actions/runs/30257900134
Detection Date: 2026-07-27

Action Required

• Review and update this documentation file
• Update ms.date frontmatter to current date
• Verify technical accuracy of content
• Close this issue manually after fixes are merged