[BENCH-822] Fix Coval LLM run-template payload

[coval-cale]

Summary

• send Coval run-template agent_ids and test_set_ids as arrays
• send iteration_count at the top level
• assert the live payload contract in the sync test

Production finding

The first llm-sync execution (llm-sync-xch9w) failed with Coval INVALID_ARGUMENT because the old singular fields were rejected. The scheduler is paused until this fix is released.

Validation

• Ruff check and format
• strict mypy
• tests/unit/test_coval_agent_sync.py: 10 passed

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