Actual debugging observation
The original Node command exited 1 with ENOENT for inputs/missing-file/imput.json.
Before editing, compare two hypotheses:
1. The input was never supplied. Distinguishing observation: list the selected fixture folder and inspect the real filenames.
2. The program references the wrong spelling. Distinguishing observation: compare the readFile URL in run.mjs with the actual filename.
Observed: input.json exists and contains Public practice cards / 24; the code requests imput.json. This supports hypothesis 2. The narrow repair changes that one path. No source data needs to be invented or removed.
Rerun observations
Original input: Public practice cards: 24
Different input: 读书会书签: 17
The missing-input case failed visibly. Full commands and exit statuses are retained in qa.json.