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feat(dynamics): add PlusDI, MinusDI, PlusDM, MinusDM indicators

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Complete thin Dx-composition wrapper indicators with full test coverage:

- PlusDi/MinusDi: Directional Indicator wrappers (DiPlus/DiMinus from Dx)
- PlusDm/MinusDm: Directional Movement wrappers (DmPlus/DmMinus from Dx)
- Individual validation tests per indicator directory (TALib, Skender, bounds)
- Combined unit tests (DiDm.Tests.cs) and validation tests (DiDm.Validation.Tests.cs)
- Quantower wrappers + tests for all 4 indicators
- PineScript v6 implementations with compensated RMA
- Normalized .md documentation for all indicators and categories
- 182 tests passing, 0 failures
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Miha Kralj
2026-03-11 20:21:52 -07:00
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commit 33d20f2a18
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lib/filters/sak/Sak.md
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# SAK: Swiss Army Knife
> "Nine filters walk into a bar. The bartender says, 'What'll it be?' They answer in unison: 'Same equation, different coefficients.'"
> *Nine filters walk into a bar. The bartender says, 'What'll it be?' They answer in unison: 'Same equation, different coefficients.'*
SAK is John Ehlers' unified second-order IIR filter framework that collapses nine distinct filter types into a single difference equation. Change five coefficients and the same code path produces EMA, SMA, Gaussian, Butterworth, FIR smoother, high-pass, two-pole high-pass, band-pass, or band-stop output. One transfer function. Nine behaviors. Zero code duplication.