feat: add get_levels() for support/resistance level query (closes #11)#33
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Given the return value of calc_support_resistance, a series index, and the current price, get_levels() evaluates every computed trend line at that index and classifies the results as support (level <= price) or resistance (level > price). Each level entry is (level, strength, slope, intercept) sorted by proximity to price (up to n levels each). Risk-to-reward ratios are also returned for each resistance level relative to the nearest support.
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Given the return value of calc_support_resistance, a series index, and the current price, get_levels() evaluates every computed trend line at that index and classifies the results as support (level <= price) or resistance (level > price). Each level entry is (level, strength, slope, intercept) sorted by proximity to price (up to n levels each). Risk-to-reward ratios are also returned for each resistance level relative to the nearest support.