[RClaudiuM]

cadquery.func.fillet and cadquery.func.chamfer call builder.Shape() even when builder.Build() failed. Shape() then builds again, and that second build of BRepFilletAPI_MakeFillet / BRepFilletAPI_MakeChamfer segfaults inside OCCT, so a fillet that is too large kills the process instead of raising.

This checks IsDone() right after Build() and raises ValueError, the same guard #2106 added for makeNSidedSurface. The check runs before _update_history, so a failed operation is not recorded in the history. The docstrings now list the ValueError.

Fixes #2114

Test

test_fillet_chamfer_failure in tests/test_free_functions.py fillets and chamfers every edge of a unit box by 0.5, which cannot be built, and expects ValueError.

pytest "tests/test_free_functions.py::test_fillet_chamfer_failure"

• Before: Fatal Python error: Segmentation fault (exit 139) for both fillet and chamfer
• After: 2 passed; tests/test_free_functions.py 74 passed

black --check (CadQuery fork) is clean. mypy cadquery reports the same errors before and after this change (missing OCP stubs in a pip install). On a pip install on macOS arm64, the full suite gives the same results as master: test_interpPlate also fails on master there, and test_examples / test_jupyter need docutils and IPython.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.81%. Comparing base (477d87d) to head (a72ca6f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2132   +/-   ##
=======================================
  Coverage   95.81%   95.81%           
=======================================
  Files          30       30           
  Lines        9605     9609    +4     
  Branches     1443     1445    +2     
=======================================
+ Hits         9203     9207    +4     
  Misses        247      247           
  Partials      155      155           

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