Add GEPA eval upload command

[willccbb]

Summary

• Add prime gepa push <run_dir> for uploading Verifiers GEPA outputs as platform evaluations
• Validate metadata.json and results.jsonl, load optional GEPA artifacts, and preserve GEPA metadata including eval_kind
• Push samples directly from results.jsonl without injecting task or task_type
• Keep the existing eval upload flow unchanged

Testing

• Added unit tests for GEPA run loading, upload request construction, CLI routing, metadata preservation, missing artifact validation, and sample shape handling
• Ran ruff, ty, and the Prime test suite successfully

---

Note

^{Cursor Bugbot is generating a summary for commit 839be1d. Configure here.}

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

There are 2 total unresolved issues (including 1 from previous review).

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit 53f1b56. Configure here.}