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

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

lib/filters/bpf/Bpf.md

@@ -1,5 +1,7 @@
 # BPF (Bandpass Filter)
 
+> *Most market data is noise. A sliver is signal. The rest is just detailed evidence of human panic.*
+
 | Property         | Value                            |
 | ---------------- | -------------------------------- |
 | **Category**     | Filter                        |
@@ -16,8 +18,6 @@
 - Requires `Math.Max(lowerPeriod, upperPeriod)` bars of warmup before first valid output (IsHot = true).
 - Validated against TA-Lib, Skender, and Tulip reference implementations where available.
 
-> "Most market data is noise. A sliver is signal. The rest is just detailed evidence of human panic."
-
 The **BPF** (BandPass Filter) is a second-order IIR architecture designed to surgically excise specific frequency components from a time series. By cascading a HighPass Filter (to reject trend) and a LowPass Filter (to reject noise), it isolates cyclic energy within a user-defined window. Unlike simple moving average crossovers which smear data, the BPF relies on Gaussian-based coefficients to achieve steeper roll-off with deterministic phase characteristics.
 
 ## Historical Context