fix: raise ValueError for RSI/ATR period < 1#3
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period=0 caused ZeroDivisionError in the Wilder ewm alpha (1/period). Match ema/macd, which already reject non-positive spans with ValueError.
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rsi() and atr() divide by period with no guard, so period=0 raises ZeroDivisionError. Reject period < 1 with ValueError; period=1 still works.