fix(docs): render the repository-structure tree as a tree

[hyperpolymath]

The "Repository Structure" block was hard-wrapped by the AsciiDoc→Markdown conversion, so the entire tree collapsed into a single paragraph and rendered as one run-on line.

Rebuilt from the block's own content:

• depth recovered from the │ continuation bars that survived the wrap
• the guide entry moved under .github/, where the guide actually lives
• \# escapes unescaped, └── restored on the last entry of each group
• the block fenced with ```text so it renders as a tree

Every annotation ("Perimeter 1-2" etc.) is preserved — nothing invented, nothing dropped.

[coderabbitai]

📝 Summary

Summary by CodeRabbit

• Documentation
  • Updated contributor setup guidance to recommend Guix instead of Nix.
  • Clarified toolbox and distrobox setup steps.
  • Reorganised the repository structure and workflow sections.
  • Corrected the commit message example and expanded guidance on commit bodies and footers.

Walkthrough

The contribution guide now uses Guix setup instructions, updates repository structure details, corrects Markdown formatting, and documents a structured commit message format with body and footer guidance.

Changes

Contribution guide

Layer / File(s)	Summary
Setup and document structure .github/CONTRIBUTING.md	Setup instructions now use guix develop. Clone, toolbox, distrobox, and verification commands were reformatted. The repository structure and headings were updated.
Development workflow guidance .github/CONTRIBUTING.md	The commit message example now uses type(scope): description and includes body and footer guidance.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Other

Suggested reviewers: metadatastician

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title accurately identifies the repository-structure tree rendering fix, which is a documented part of the changeset.
Description check	✅ Passed	The description directly explains the repository-structure tree repair and matches the documented changes.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud