Feature: Add eval push to env hub.

[d42me]

Closes ENG-2132

Adds support for --push-to-hub flag for Environment Hub

Example command:

prime env eval gsm8k -m meta-llama/llama-3.1-70b-instruct -n 2 -r 1 --push-to-hub

---

Note

Adds a --push-to-hub flag to prime env eval to upload vf-eval results to Prime Evals Hub, including environment ID resolution and async support in evals client.

• CLI:
  • packages/prime/src/prime_cli/commands/env.py
    • Add --push-to-hub (-P) to prime env eval; on success, pushes results via helper.
    • Wire in push_eval_results_to_hub(environment, model, job_id) and handle errors.
• Utility:
  • packages/prime/src/prime_cli/utils/eval_push.py (new)
    • Parse latest vf-eval outputs (metadata.json, results.jsonl), resolve environment, convert samples, create evaluation, push samples, and finalize via EvalsClient.
    • Prints hub URL when available.
• SDK (prime-evals):
  • packages/prime-evals/src/prime_evals/evals.py
    • Add environment resolution via /environmentshub/resolve; raise EvalsAPIError on missing env.
    • Resolve environment IDs in create_evaluation (sync/async; async uses asyncio.gather).
    • Import APIError; expose new EvalsAPIError.

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