PR Summary

Backport of PowerShell#26219 to release/v7.5 branch. Adds automated markdown link verification infrastructure for CI/CD.

PR Context

Cherry-picked commit 7bcdda7 from master to enable markdown link validation in v7.5 release branch. No conflicts encountered.

Changes:

• GitHub Action for markdown link verification using PowerShell + Markdig
• Validates HTTP/HTTPS links with configurable timeouts/retries
• Validates local file references
• Scheduled weekly runs to catch link rot
• PowerShell parameter naming guidelines documentation

Files added (916 lines):

• .github/actions/infrastructure/markdownlinks/ - Action implementation
• .github/workflows/verify-markdown-links.yml - Workflow config
• .github/instructions/powershell-parameter-naming.instructions.md - Naming guidelines

Original PR: PowerShell#26219
Author: @TravisEz13
Merge commit: 7bcdda7

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
• This PR is ready to merge. If this PR is a work in progress, please open this as a Draft Pull Request and mark it as Ready to Review when it is ready to merge.
• Breaking changes
  • None
• User-facing changes
  • Not Applicable
• Testing - New and feature
  • N/A or can only be tested interactively

Custom agent used: backport-agent
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