Fix delta_x usage in msipddp_solver

[astomodynamics]

Summary

• Fix issue where delta_x reference becomes invalid after workspace_.delta_x_vectors[t] is reassigned
• Compute delta_x value before using it to ensure correct behavior

Changes

• Modified two locations in msipddp_solver.cpp where delta_x was being used after reassignment
• Changed from using a const reference to computing the value first

Test plan

• Verify existing tests pass
• Check solver behavior with interior point methods

[gemini-code-assist]

Summary of Changes

Hello @astomodynamics, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves a critical bug within the msipddp_solver that could lead to incorrect calculations due to an invalid reference. By adjusting the order of operations for delta_x computation and assignment, the solver's numerical stability and correctness are significantly improved, preventing potential runtime errors or inaccurate results.

Highlights

• Invalid delta_x reference: Addresses an issue in msipddp_solver.cpp where the delta_x reference could become invalid due to reassignment of workspace_.delta_x_vectors[t].
• delta_x computation logic: Modifies the logic to compute the delta_x value directly before workspace_.delta_x_vectors[t] is updated, ensuring delta_x always holds the correct, intended value.

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