feat: add invopt method to enable or disable inverse solving for load steps

[germa89]

Description

Adding INVOPT command.

Issue linked

Close #3976

Checklist

• I have visited and read Develop PyMAPDL.
• I have tested my changes locally
• I have added necessary documentation or updated existing documentation.
• I have followed the PyMAPDL coding style guidelines.
• I have added appropriate unit tests that also ensure the minimal coverage criteria.
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved to the PR if any.
• I have assigned this PR to myself.
• I have marked this PR as draft if it is not ready to be reviewed yet.
• I have made sure that the title of my PR follows Commit naming conventions (e.g. feat: adding new MAPDL command)

Summary by Sourcery

New Features:

• Add invopt method to toggle inverse solving for static analysis load steps

[ansys-reviewer-bot]

Thanks for opening a Pull Request. If you want to perform a review write a comment saying:

@ansys-reviewer-bot review

[sourcery-ai]

Reviewer's Guide

This pull request introduces the INVOPT command wrapper to the AnalysisOptions class, enabling users to toggle inverse solving on a per‐load‐step basis. The implementation adds a new method following existing patterns, includes parameter validation via docstring, and leverages the generic run() interface. Corresponding unit tests and documentation updates ensure coverage and reflect the new feature.

Sequence Diagram for INVOPT Command Execution

sequenceDiagram
    actor User
    User->>AnalysisOptions: invopt(option="ON")
    AnalysisOptions->>MAPDL: run("INVOPT,ON")
    MAPDL-->>AnalysisOptions: ExecutionResult
    AnalysisOptions-->>User: ExecutionResult

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Updated Class Diagram for AnalysisOptions

classDiagram
    class AnalysisOptions {
        +invopt(option: string) : object
    }

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File-Level Changes

Change	Details	Files
Added invopt method to wrap the INVOPT APDL command	Defined invopt signature with option parameter Wrote detailed docstring (Parameters, Notes, APDL Command) Implemented return self.run(f"INVOPT,{option}", **kwargs)	src/ansys/mapdl/core/_commands/solution/analysis_options.py
Expanded unit tests to cover INVOPT functionality	Added tests for enabling (ON) and disabling (OFF) inverse solving Asserted correct command string is sent to run() Ensured behavior matches default forward solving case	tests/test_solution_commands.py
Updated documentation to include INVOPT command	Added INVOPT section to analysis options reference Documented usage examples and notes linking to Structural Analysis Guide	docs/source/commands/analysis_options.rst

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#3976	Provide a direct API/function in PyMAPDL to execute the invopt, on MAPDL command, enabling or disabling inverse solving for the current load step.	✅

Possibly linked issues

• PyMAPDL lacks a direct API/function for executing the "invopt, on" mapdl command (Turn on Inverse Solving) #3976: PR adds the invopt method to PyMAPDL, implementing the requested API.

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[sourcery-ai]

Hey @germa89 - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Documentation: all looks good

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.25%. Comparing base (628dde1) to head (4974d36).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3979      +/-   ##
==========================================
- Coverage   88.26%   88.25%   -0.02%     
==========================================
  Files         187      187              
  Lines       14941    14943       +2     
==========================================
  Hits        13188    13188              
- Misses       1753     1755       +2     

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[germa89]

@pyansys-ci-bot LGTM.

[pyansys-ci-bot]

✅ Approving this PR because germa89 said so in here 😬