Chinese exam countdown for DeepSeek Harness

Key features

• Exact rule dates2nd-sat (second Saturday) and 1st-sun (first Sunday) computed by pure date math (CET-4/6, JLPT)
• Fixed-date exams use the national unified date
• Rolling recurrenceonce a date passes it rolls to the same date next year
• only upcoming (days = 0) results are returned
• Flexible queriesexact id, substring query against name/id/note, or category filter, sorted by days ascending