Fix cuOpt solver name formatting for versions with != 3 components

[ramakrishnap-nv]

Fixes # .

Summary/Motivation:

_get_cuopt_version formats the solver name with "cuOpt %s.%s%s" % tuple(cuopt.__version__.split('.')), which requires the version to have exactly three dot-separated components. cuOpt nightly wheels carry a PEP 440 .post suffix (e.g. 26.10.0a37.post260819050903), giving four components and raising:

pyomo/solvers/plugins/solvers/cuopt_direct.py:37: in _get_cuopt_version
    CUOPTDirect._name = "cuOpt %s.%s%s" % CUOPTDirect._version
E   TypeError: not all arguments converted during string formatting

Since this runs in the attempt_import callback, it fires when Pyomo resolves its solver plugins and aborts pytest collection for any module that touches the solver list, not just cuOpt's own tests.

It also fixes the 3-component case, which dropped a separator: 26.10.00 rendered as cuOpt 26.1000.

cuopt.__version__	before	after
26.10.0a37.post260819050903	TypeError	cuOpt 26.10.0a37.post260819050903
26.10.00a37	cuOpt 26.1000a37	cuOpt 26.10.00a37
26.10.00	cuOpt 26.1000	cuOpt 26.10.00

Changes proposed in this PR:

• Format the cuOpt solver name from the version string directly, so it is correct for any number of version components. _version is unchanged, so version() behaviour is unaffected.

AI-Use Disclosure

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Notes for reviewers (optional): The change is a one-line formatting fix. Verified by evaluating the format against the version strings cuOpt ships (release, nightly conda, nightly wheel) and by running black --check. No test was added — happy to add one if you'd like coverage for the version-parsing callback.

Legal Acknowledgement

By contributing to this software project, I have read the contribution guide and agree to the following terms and conditions for my contribution:

1. I agree my contributions are submitted under the BSD license.
2. I represent I am authorized to make the contributions and grant the license. If my employer has rights to intellectual property that includes these contributions, I represent that I have received permission to make contributions and grant the required license on behalf of that employer.

[mrmundt]

Hi @ramakrishnap-nv - The PR description deleted a required part of the template (AI disclosure), so this will be closed by policy. Please feel free to reopen with the correct template and we will happily review it.

[ramakrishnap-nv]

Thanks @mrmundt, and apologies for stripping the template. GitHub would not let me reopen this one (422 on reopen), so I've resubmitted the same commit with the full template, including the AI-Use Disclosure, as #4027.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.94%. Comparing base (2744a24) to head (7171f7c).

Files with missing lines	Patch %	Lines
pyomo/solvers/plugins/solvers/cuopt_direct.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4026   +/-   ##
=======================================
  Coverage   89.94%   89.94%           
=======================================
  Files         917      917           
  Lines      109250   109250           
=======================================
+ Hits        98263    98267    +4     
+ Misses      10987    10983    -4     

Flag	Coverage Δ
builders	29.12% <0.00%> (+<0.01%)	⬆️
default	86.14% <0.00%> (?)
expensive	35.10% <0.00%> (?)
linux	87.67% <0.00%> (-1.98%)	⬇️
linux_other	87.67% <0.00%> (-0.01%)	⬇️
oldsolvers	27.58% <0.00%> (+<0.01%)	⬆️
osx	83.12% <0.00%> (ø)
win	85.44% <0.00%> (+<0.01%)	⬆️

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