Fix #71 isolated isntance properties from class properties

[cjtu]

Problem

ROIs added via add_annuli/add_circles were registered as property objects on the class (setattr(self.class, ...)), not the instance. As a result, an ROI added to one CraterDatabase appeared on every instance — its name showed up in the repr but accessing it raised KeyError because the column only existed in the originatin

a = CraterDatabase(crater_list, 'moon
b = CraterDatabase(crater_list, 'moon')
a.add_annuli('new', 1, 3)
print(b) # ...includes "new" ← wrong
b.new # KeyError ←

Fix

Track ROIs per-instance instead of polluting the class:

• New self._roi_names dict (attr name → data column) populated by _make_data_property.
• getattr resolves registered ROInames to self.data column, preserving the convenient cdb.ejecta access and raising a proper AttributeError for unknown names. It reads _roi_names via self.dict to avoid recursion before init sets it (also safe under deepcopy/copy).
• _get_properties/repr now combine the static class properties with the instance's own ROIs.

After the fix, b no longer reports or exposes new, and b.new raises AttributeError.

Tests

• Added test_roi_attrs_are_per_instance: adds an ROI to one copy and asserts it's present on that instance but absent from another's repr and raises AttributeError on access.

Other

• Version bump 0.11.2 → 0.11.3 (+ uv.lock sync).

Closes #71

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.99%. Comparing base (a04a81c) to head (ff219df).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #110      +/-   ##
==========================================
+ Coverage   96.95%   96.99%   +0.04%     
==========================================
  Files           4        4              
  Lines         525      532       +7     
  Branches       75       76       +1     
==========================================
+ Hits          509      516       +7     
  Misses          8        8              
  Partials        8        8              

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