First implementation (#1)

Reviewed-on: #1

fixtures/records/grades/anchor-hit.json

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+{"exercise":"tag:scient.ing,2026:annotation:smithlab/whcypxav2cqbx","format":"scienting-grade/1","items":[{"element":"element:0","feedback":"That is the cell.","max":"1","points":"1"}],"max":"1","score":"1","submission":"kpjevbt3j6s3w"}

fixtures/records/grades/anchor-miss.json

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+{"exercise":"tag:scient.ing,2026:annotation:smithlab/whcypxav2cqbx","format":"scienting-grade/1","items":[{"element":"element:0","feedback":"Look in Table 1, row CT–CT.","max":"1","points":"0"}],"max":"1","score":"0","submission":"ysw9hjztre498"}

fixtures/records/grades/check-overlap.json

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+{"exercise":"tag:scient.ing,2026:annotation:smithlab/y7bd3he0jwjbx","format":"scienting-grade/1","items":[{"element":"verdict","feedback":"","max":"1","points":"1"},{"element":"element:0","feedback":"","max":"1","points":"1"}],"max":"2","score":"2","submission":"n7me2fmcw8ree"}