Qc plots supports split files

[rbeucher]

This pull request introduces support for generating combined timeseries QC plots from sets of split CMORised NetCDF files, improves CLI and template integration, and adds extensive unit tests for the new functionality. The main changes are grouped below.

Combined Timeseries Plotting for Split Files:

• Added generate_qc_plots_for_split_files to plots.py, which concatenates multiple time-chunked NetCDF files for the same variable and produces a single timeseries plot spanning the full period. This function is now exported in __init__.py. [1] [2]
• Implemented logic to group files by their "base key" (stem without time-range token) and detect split-file groups for combined plotting. [1] [2]

CLI and Template Integration:

• Updated the CLI (main in plots.py) to automatically generate combined timeseries plots for detected split-file groups, including parallel execution support and reporting. [1] [2] [3]
• Modified the CMOR Python script template to call generate_qc_plots_for_split_files when multiple files are written, ensuring combined plots are generated during workflows.

Testing:

• Added comprehensive unit tests for split-file handling, the new grouping logic, and combined timeseries plotting, including CLI-level tests and edge cases. [1] [2]

[codecov]

Codecov Report

❌ Patch coverage is 21.12676% with 56 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.3%. Comparing base (fbf9e90) to head (8ac8d59).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/access_moppy/qc/plots.py	20.0%	56 Missing ⚠️

❌ Your patch status has failed because the patch coverage (21.1%) is below the target coverage (90.0%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #553     +/-   ##
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- Coverage   74.9%   74.3%   -0.5%     
=======================================
  Files         36      36             
  Lines       7204    7274     +70     
  Branches    1344    1354     +10     
=======================================
+ Hits        5394    5408     +14     
- Misses      1525    1581     +56     
  Partials     285     285             

Flag	Coverage Δ
unit	74.3% <21.1%> (-0.5%)	⬇️

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