add option to change subsolver in AL

[MaxenceGollier]

No description provided.

[Copilot]

Pull request overview

This PR adds support for selecting which subproblem solver the Augmented Lagrangian (AL) algorithm uses, and expands tests to cover running AL with different subsolvers.

Changes:

• Add a subsolver keyword pathway for equality-constrained AL runs (and update the AL docstring example accordingly).
• Update ALSolver construction to accept a configurable subsolver.
• Extend test_AL.jl to exercise AL with R2Solver and R2NSolver.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/AL_alg.jl	Introduces configurable AL subsolver selection and updates the public docstring/example.
test/test_AL.jl	Adds regression coverage for selecting AL subsolvers (R2Solver, R2NSolver).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.85%. Comparing base (e0f214d) to head (fe2b13c).
⚠️ Report is 281 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #310       +/-   ##
===========================================
+ Coverage   61.53%   83.85%   +22.31%     
===========================================
  Files          11       12        +1     
  Lines        1292     1641      +349     
===========================================
+ Hits          795     1376      +581     
+ Misses        497      265      -232     

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[dpo]

Thank you.