Add Open Category

[jatkinson1000]

Closes #152

Add OPEN to AGB_Genders Flag Enum and set as default, with MALE becoming an alias for backwards compatibility.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.28%. Comparing base (31c74ca) to head (965dc17).
⚠️ Report is 6 commits behind head on agb-2026-classifications.

Additional details and impacted files

@@                    Coverage Diff                    @@
##           agb-2026-classifications     #169   +/-   ##
=========================================================
  Coverage                     98.28%   98.28%           
=========================================================
  Files                            34       34           
  Lines                          2326     2337   +11     
=========================================================
+ Hits                           2286     2297   +11     
  Misses                           40       40           

Files with missing lines	Coverage Δ
archeryutils/classifications/AGB_data.py	100.00% <100.00%> (ø)
...utils/classifications/agb_field_classifications.py	100.00% <ø> (ø)
...tils/classifications/agb_indoor_classifications.py	100.00% <ø> (ø)
...ils/classifications/agb_outdoor_classifications.py	100.00% <100.00%> (ø)
...cheryutils/classifications/classification_utils.py	78.46% <ø> (ø)
tests/unit/classifications/test_agb_field.py	100.00% <100.00%> (ø)
tests/unit/classifications/test_agb_indoor.py	100.00% <100.00%> (ø)
tests/unit/classifications/test_agb_outdoor.py	100.00% <100.00%> (ø)
.../unit/classifications/test_classification_utils.py	100.00% <ø> (ø)

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