500 MW EGS Case Study Update (Fervo_Project_Cape-7) [v3.18.4]

[softwareengineerprogrammer]

Description

1. Fervo_Project_Cape-7 (Fervo_Project_Cape-5 2026 Update v2). Documentation: Fervo_Project_Cape-7_2026-10-02.pdf
2. MACRS support - Depreciation Schedule parameter

Testing & Verification

1. Unit tests added:
   1. Fervo_Project_Cape-7
   2. test_fervo_project_cape_7
2. Unit tests updated:
   1. test_fervo_project_cape_5
3. Manual testing: https://gtp.scientificwebservices.com/geophires/?geophires-example-id=Fervo_Project_Cape-7

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Change Checklist

Observe the following checklist items before and after merging, as applicable.

Before merging:

1. I certify that I am a human and I have manually verified the correctness of the changes in this PR.
2. Add a CHANGELOG entry if your change includes a new version¹ (example). RST Template:

M.m.P: `TITLE <https://github.com/NREL/GEOPHIRES-X/pull/PR-NUMBER>`__ | `release <https://github.com/NREL/GEOPHIRES-X/releases/tag/vM.m.P>`__

After merging:

1. Push tag(s) to GitHub: git push origin refs/tags/vM.m.P
2. Post a change announcement to the GEOPHIRES Change Announcements Discussion (example). Markdown template:

 M.m.p: [TITLE](https://github.com/NREL/GEOPHIRES-X/pull/PR-NUMBER) | [release](https://github.com/NREL/GEOPHIRES-X/releases/tag/vM.m.P)

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Self-reviewed in #188

Footnotes

1. See versioning notes and version management docs. ↩