Harden markdownlint target selection to skip generated root guides

[Copilot]

The markdownlint Actions job was failing on generated docs under docs/root-guides/ with large volumes of MD060/MD007 violations. This change narrows markdown target selection so the workflow lints intended maintainable markdown sources only.

• Workflow change: target filter hardening

  • Updated .github/workflows/markdown-quality.yml (Select markdown targets step).
  • Extended is_markdown_target() exclusion patterns to skip:
    • docs/root-guides/*

• Contract test update

  • Updated tests/test_markdown_quality_workflow.py to assert the workflow script includes the docs/root-guides/* exclusion, preventing drift.

case "$file" in
  */node_modules/*|...|data_out/*|mount/*|docs/root-guides/*|*/CHANGELOG.md|CHANGELOG.md)
    return 1
    ;;
esac

[Copilot]

@Bryan-Roe Unfortunately, I hit an error while trying to use the custom Copilot setup steps configured for this repository and had to close this PR. The error I am seeing is:

no `copilot-setup-steps` job found in your `copilot-setup-steps.yml` workflow file. Please ensure you have a single job named `copilot-setup-steps`. For more details, see https://gh.io/copilot/actions-setup-steps

Once you or someone with the necessary access fixes the problem, please unassign and then reassign issue #0 to me and I'll retry. Thanks!

[Copilot]

@Bryan-Roe Thanks for sending me some feedback. Unfortunately, I hit an error while trying to use the custom Copilot setup steps configured for this repository. The error I am seeing is:

no `copilot-setup-steps` job found in your `copilot-setup-steps.yml` workflow file. Please ensure you have a single job named `copilot-setup-steps`. For more details, see https://gh.io/copilot/actions-setup-steps

Once you or someone with the necessary access fixes the problem, please let me know in a comment and I'll try again. Thanks!

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[Copilot]

@Bryan-Roe Thanks for sending me some feedback. Unfortunately, I hit an error while trying to use the custom Copilot setup steps configured for this repository. The error I am seeing is:

no `copilot-setup-steps` job found in your `copilot-setup-steps.yml` workflow file. Please ensure you have a single job named `copilot-setup-steps`. For more details, see https://gh.io/copilot/actions-setup-steps

Once you or someone with the necessary access fixes the problem, please let me know in a comment and I'll try again. Thanks!

[Copilot]

Pull request overview

Narrows Markdown linting to exclude generated root guides and adds a contract assertion.

Changes:

• Excludes docs/root-guides/* from lint targets.
• Tests that the exclusion remains configured.
• Review found stale local lint guidance.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
.github/workflows/markdown-quality.yml	Adds generated-guide exclusion.
tests/test_markdown_quality_workflow.py	Verifies exclusion presence.