[WIP] Update script and markdownlint configuration for pre-commit fixes

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

This pull request contains two changes to address pre-commit failures and tools warnings:

Files modified/added:

• regenerate_presentation.sh: Update the script so TMP_PDF is assigned and actually used. When LibreOffice (soffice) is available the script converts the generated PPTX to PDF, finds the generated PDF in the OUT_DIR and moves it to the expected OUT_PDF. Preserve existing fallback to pandoc->pdf when LaTeX is available.
• .markdownlint.json: New file setting MD013 (line_length) to 120 to reduce noise from many long lines in repository Markdown files.

Notes:

• Changes are committed on the branch fix/pre-commit.
• This PR does NOT update workflows or address GitHub Actions pinning policy (actions/checkout and attest-build-provenance). Those require forking or vendorizing external actions and will be handled separately.

Please create the pull request from branch fix/pre-commit into main with title: "chore: fix pre-commit issues (shellcheck & markdownlint)" and include the following description in the PR body:

"Summary

• Fix ShellCheck SC2034 in regenerate_presentation.sh by using TMP_PDF (detect and move LibreOffice-generated PDF).
• Add .markdownlint.json to relax MD013 to 120 columns.
• Pre-commit fixed trailing whitespace and EOF for multiple files; include those fixes in this PR.

Notes

• This PR does not change workflow pinning for external Actions; repository policy may require forking or vendorizing external Actions."

This pull request was created as a result of the following prompt from Copilot chat.

This pull request contains two changes to address pre-commit failures and tools warnings:

Files modified/added:

• regenerate_presentation.sh: Update the script so TMP_PDF is assigned and actually used. When LibreOffice (soffice) is available the script converts the generated PPTX to PDF, finds the generated PDF in the OUT_DIR and moves it to the expected OUT_PDF. Preserve existing fallback to pandoc->pdf when LaTeX is available.
• .markdownlint.json: New file setting MD013 (line_length) to 120 to reduce noise from many long lines in repository Markdown files.

Notes:

• Changes are committed on the branch fix/pre-commit.
• This PR does NOT update workflows or address GitHub Actions pinning policy (actions/checkout and attest-build-provenance). Those require forking or vendorizing external actions and will be handled separately.

Please create the pull request from branch fix/pre-commit into main with title: "chore: fix pre-commit issues (shellcheck & markdownlint)" and include the following description in the PR body:

"Summary

• Fix ShellCheck SC2034 in regenerate_presentation.sh by using TMP_PDF (detect and move LibreOffice-generated PDF).
• Add .markdownlint.json to relax MD013 to 120 columns.
• Pre-commit fixed trailing whitespace and EOF for multiple files; include those fixes in this PR.

Notes

• This PR does not change workflow pinning for external Actions; repository policy may require forking or vendorizing external Actions."

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.