refactor(config): distinguish model names from objects

[manzuoni-astera]

Summary

• rename structure-predictor name fields to model_name across guidance, grid-search jobs, and job results
• preserve the public --model CLI flag with an explicit argparse destination
• keep wrapper constructor model parameters unchanged because those hold loaded model objects
• intentionally make the serialized schema change cleanly without legacy pickle/JSON migration shims

Implements #289. This PR is intentionally stacked on #300 because it updates the Protpardelle-integrated guidance files; #289 should remain open until the stack reaches main.

The README CLI examples remain valid because --model is unchanged.

Validation

• pytest tests/cli/test_guidance_cli.py tests/utils/test_guidance_script_arguments.py tests/utils/test_guidance_script_utils.py -q (110 passed)
• targeted ty check passes
• ruff check and ruff format --check on touched Python files
• git diff --check

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[marcuscollins]

Do we also need to update the readme? I guess we can still use --model, so maybe not.

[manzuoni-astera]

Addressed the review in fa6ac7a:

• replaced the assertions with a descriptive RuntimeError
• removed all legacy pickle and results.json migration shims and their compatibility-only tests
• kept README examples unchanged because the public --model flag is unchanged

Focused CLI/config/metadata tests pass (110 passed) and targeted type/lint checks are clean. Ready for re-review.