gem/oq-engine — reverse-engineered prompt

Build me a Python open source tool like OpenQuake Engine for seismic hazard and risk analysis. I want users to set up an earthquake study, run calculations for hazard and risk, and get clear outputs they can use for assessment and decision making.

Include a few demo projects so someone can try it without their own data, and make the workflow feel guided, with helpful error messages and readable result summaries. It should support scientific users who care about GEM methods and standards, but it should still be reasonable for a new user to install and run.

Please include basic documentation for getting started, user guide notes, API reference style comments, and release notes. Add tests where they matter, and make sure it can run on common Python versions and operating systems. Look up the current OpenQuake docs online if you need to match the expected behavior.