Add Testing Documentation for Standalone Detailed Inspection

[wangz539]

Summary

This PR adds the guide for users who need to validate their own ATC-138 MATLAB vs. Python results using the standalone comparison engine (compare_runs.py) and explains the metrics used in ATC-138.

Contents

• Describes the validation workflow for MATLAB vs Python outputs
• Documents the four comparison metrics
• Includes example results for two representative models (ICSB, HaseltonRCMF_4story)

Motivation

While the current repo includes integration tests, this doc provides more detailed instructions for users who need to validate their own models outside of the testing framework. The metrics we use for the published version are also explained.

[hgp297]

Are there elements inside the ipynb that are critical to testing? e.g. Example code lines or images etc.?

If not, I would try to make this in Markdown/plain text as much as possible to make it out-of-the-box accessible.

Also, please try to remove commits 7590d04 and 9fdf134 from history. Recommended actions:

git checkout testing-doc
git fetch origin
git rebase -i origin/main

Then, in the rebase message, delete the pick lines that have 7590d04 and 9fdf134. save and exit this rebase message