fix: correct overload param names, __array__ protocol, _wrap_result precedence, duplicate alias guard

[henryiii]

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Summary

Five bug-fix groups in the object backend and overload definitions:

• Typo'd overload parameter names (ptau/pE/pe/pM/pm → pt): In the 4D overloads whose temporal coordinate is tau/E/e/M/m, the transverse-momentum keyword was corrupted by a mechanical substitution. The correct momentum alias for rho with polar azimuthal coordinates is always pt. Fixed in both src/vector/_methods.py and src/vector/backends/object.py.

• NumPy 2 __array__ protocol: All six __array__ methods in object.py now accept dtype=None and copy=None keyword arguments. Previously np.asarray(v, dtype=np.float64) and np.array(v, copy=False) raised TypeError. Now dtype=None returns the array as-is (preserving subclass via asanyarray), and any other dtype is forwarded to numpy.asarray.

• Operator-precedence bug in _wrap_result: In VectorObject2D._wrap_result and VectorObject3D._wrap_result the isinstance(...) checks bound only to the right arm of the or instead of the whole condition. Parentheses corrected to match the intended logic (latent bug — current dispatch maps do not trigger it).

• Duplicate temporal alias guard: vector.obj(x=1, y=2, z=3, E=10, e=99) previously returned e=99 silently (the e branch unconditionally overwrote the t set by E). Likewise for M+m. Both now raise TypeError("duplicate coordinates ...").

• Docstring/error-message fixes: LongitudinalObjectEta.elements docstring said "(theta)" → "(eta)"; twelve VectorObject4D.from_* docstrings said VectorObject3D/MomentumObject3D → 4D variants; the numpy.not_equal ufunc branch error message said 'numpy.equal'.

Test plan

• uv run pytest tests/backends/test_object.py tests/test_methods.py -q — 8 passed
• uv run pytest --ignore=tests/test_notebooks.py -q — 813 passed, 3 skipped
• prek -a --quiet — all hooks passed
• New tests: test_duplicate_temporal_aliases_raise and test_array_protocol_numpy2 in tests/backends/test_object.py

Part of #711

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.22%. Comparing base (d9ef1db) to head (7c5490f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #720      +/-   ##
==========================================
+ Coverage   87.16%   87.22%   +0.06%     
==========================================
  Files          96       96              
  Lines       11199    11221      +22     
==========================================
+ Hits         9762     9788      +26     
+ Misses       1437     1433       -4     

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