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/hpf/Hpf.md

@@ -1,5 +1,7 @@
 # HPF: Ehlers Highpass Filter
 
+> *Noise is just signal you haven't figured out how to filter yet. Or maybe, it's the only signal that matters.*
+
 | Property         | Value                            |
 | ---------------- | -------------------------------- |
 | **Category**     | Filter                        |
@@ -16,8 +18,6 @@
 - Requires `length` bars of warmup before first valid output (IsHot = true). Default: **40 bars**.
 - Validated against TA-Lib, Skender, and Tulip reference implementations where available.
 
-> "Noise is just signal you haven't figured out how to filter yet. Or maybe, it's the only signal that matters."
-
 The 2-Pole Highpass Filter (HPF) is designed to separate high-frequency components (like cycles and noise) from the underlying trend. By suppressing low-frequency movements, it acts as a "detrender," making it invaluable for oscillator construction and cycle analysis.
 
 ## Historical Context