Enhance milstd1750 analysis

[godcodehunter]

Your checklist for this pull request

• I've read the guidelines for contributing to this repository.
• I made sure to follow the project's coding style.
• I've documented every RZ_API function and struct this PR changes.
• I've added tests that prove my changes are effective (required for changes to RZ_API).
• I've updated the Rizin book with the relevant information (if needed).
• I've used AI tools to generate fully or partially these code changes and I'm sure the changes are not copyrighted by somebody else.

Detailed description

Usage of AI tools
For this pull request, Claude Code was used, with most of the code generated using the work declaration.

First, I asked for a table of missing parts of the analysis. Then, I got acquainted with what each part does, next I generated most of the code, step by step, verifying its correctness.

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Test plan

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Closing issues

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[codecov]

Codecov Report

❌ Patch coverage is 87.75000% with 49 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.98%. Comparing base (478117d) to head (752576f).
⚠️ Report is 31 commits behind head on dev.

Files with missing lines	Patch %	Lines
librz/arch/p/analysis/analysis_milstd1750.c	87.71%	29 Missing and 20 partials ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
librz/arch/isa/milstd1750/milstd1750_disas.c	81.61% <100.00%> (-0.09%)	⬇️
librz/arch/p/analysis/analysis_milstd1750.c	89.14% <87.71%> (+0.77%)	⬆️

... and 78 files with indirect coverage changes

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[wargio]

please always declare which AI/LLM model have you used for this and how it is helping you.

[godcodehunter]

please always declare which AI/LLM model have you used for this and how it is helping you.

Ok got it

[wargio]

add some tests