Add support for urban cover (param 229001)

[dsarmany]

Description

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[Copilot]

Pull request overview

Adds support for the “urban cover” parameter (param=229001) in the mars2grib backend concept matchers so it is treated like other surface, point-in-time fields during GRIB encoding.

Changes:

• Include 229001 in the pointInTime concept matcher so point-in-time keys are encoded using the default variant.
• Include 229001 in the levtype=SFC → LevelType::Surface mapping.

Reviewed changes

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

File	Description
src/metkit/mars2grib/backend/concepts/point-in-time/pointInTimeMatcher.h	Adds 229001 to the default point-in-time parameter allowlist.
src/metkit/mars2grib/backend/concepts/level/levelMatcher.h	Maps 229001 to LevelType::Surface for SFC fields.

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 14.28571% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.99%. Comparing base (250f0da) to head (32b51cf).
⚠️ Report is 7 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/metkit/mars2grib/backend/checks/matchDataset.h	0.00%	8 Missing ⚠️
...t/mars2grib/backend/deductions/backgroundProcess.h	33.33%	2 Missing ⚠️
...ars2grib/backend/checks/checkDestinELocalSection.h	0.00%	1 Missing ⚠️
...etkit/mars2grib/backend/tables/backgroundProcess.h	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #176      +/-   ##
===========================================
- Coverage    61.02%   60.99%   -0.03%     
===========================================
  Files          309      309              
  Lines        11732    11737       +5     
  Branches      1035     1037       +2     
===========================================
  Hits          7159     7159              
- Misses        4573     4578       +5     

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