More xcube rules

[forman]

[Description of PR]

Checklist (strike out non-applicable):

• Added docstrings and API docs for any new/modified user-facing classes and functions
• Changes/features documented in docs/*
• Unit-tests adapted/added for changes/features
• Test coverage remains or increases (target 100%)

[codecov]

Codecov Report

Attention: Patch coverage is 96.87500% with 2 lines in your changes missing coverage. Please review.

Project coverage is 92.92%. Comparing base (2ac2d4f) to head (a24ff64).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
xrlint/result.py	77.77%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #5      +/-   ##
==========================================
+ Coverage   92.85%   92.92%   +0.07%     
==========================================
  Files          39       40       +1     
  Lines        1231     1272      +41     
  Branches      149      158       +9     
==========================================
+ Hits         1143     1182      +39     
- Misses         54       55       +1     
- Partials       34       35       +1     

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