- add TA-Lib bindings and loader registrations for overlap studies:
TA_ACCBANDS, TA_BBANDS, TA_DEMA, TA_EMA, TA_HT_TRENDLINE, TA_KAMA
- add new public wrappers in overlap_studies.go:
AccBands, BBands, DEMA, EMA, HT_TRENDLINE, KAMA
- refactor momentum wrapper names to consistent Go-style exports
(e.g. Aroon/AroonOsc, MACDExt/MACDFix, Stoch/StochF/StochRSI,
MinusDI/MinusDM, PlusDI/PlusDM, Trix, UltOsc, WillR)
- rename MAType constants to MA_* for clearer namespacing
- update README to reflect the current exported API and overlap coverage
