Reject SPSA int params with C < 0.50 during workload validation

[yohaann196]

verify_spsa_inputs already rejected float params with C <= 0.00, but
had no equivalent check for int params. A C of 0 for an int param would
pass validation, get stored, and then cause a divide-by-zero in
spsa_workload_assignment_dict when computing r_values = a / c ** 2.

The minimum meaningful C for an int param is 0.50, which matches the
floor already applied in spsa_utils.py:

c_values = np.maximum(c_values / c_compression, np.where(is_float, 0.0, 0.5))

This fix rejects bad input at submission time with a clear error message,
consistent with how the rest of workload validation works.

[Copilot]

Pull request overview

This PR tightens SPSA workload parameter validation so that integer-typed parameters cannot be submitted with an invalid perturbation constant C (< 0.50), preventing later divide-by-zero/invalid scaling during workload assignment.

Changes:

• Update SPSA datatype validation error message to correctly say “int or float”.
• Add a new validation rule: C must be >= 0.50 when data_type is int.
• (Unrelated/likely accidental) Modify fetch_artifact_url in a way that breaks the function/module.

Comments suppressed due to low confidence (1)

OpenBench/workloads/verify_workload.py:501

• fetch_artifact_url now ends with a try: block but no except/finally and no return path. This makes the module fail to import (invalid try statement) and the new assert len(artifacts) >= len is also incorrect (compares to the built-in len function). Restore the previous completion/return + exception handling logic and fix the assertion to compare against the intended value (likely len(jobs)).

        # All jobs finished, with at least one non-expired Artifact
        assert not any(job['conclusion'] != 'success' for job in jobs)
        assert not any(artifact['expired'] for artifact in artifacts)
        assert len(artifacts) >= len

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 1 comment.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 2 comments.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.