Add hip-ra-x-result.json schema and HipRaXResult [v3.13.9]

[softwareengineerprogrammer]

Description

1. Generate categorized hip-ra-x-result.json
2. Add HipRaXResult

TODO

1. Params RST: acd2c94: hip-ra-x-parameters-rst_2026-05-26.pdf
2. HipRaXResult test coverage: 23f35f2

Testing & Verification

1. Unit tests added: N/A
2. Unit tests updated:
   1. test_hip_ra_x_examples
3. Manual testing:
   1. Reviewed JSON
   2. Reviewed RST/HTML doc
      1. 
      2. TODO for result inputs metadata

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Change Checklist:

Observe the following checklist items if your change includes a new version (see versioning notes and version management docs).

Before merging:

1. Add a CHANGELOG entry (example). RST Template:

3.13.9: `Add hip-ra-x-result.json schema and HipRaXResult <https://github.com/NREL/GEOPHIRES-X/pull/PR-NUMBER>`__ | `release <https://github.com/NREL/GEOPHIRES-X/releases/tag/v3.13.9>`__

After merging:

1. Push tag(s) to GitHub: git push origin refs/tags/v3.13.9
2. Post a change announcement to the GEOPHIRES Change Announcements Discussion: Too minor to merit announcement

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Self-reviewed in #157