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/reversals/psar/Psar.md

@@ -1,5 +1,7 @@
 # PSAR: Parabolic Stop And Reverse
 
+> *The trend is your friend until the end when it bends.*
+
 | Property         | Value                            |
 | ---------------- | -------------------------------- |
 | **Category**     | Reversal                        |
@@ -16,8 +18,6 @@
 - Requires `1` bars of warmup before first valid output (IsHot = true).
 - Validated against TA-Lib, Skender, and Tulip reference implementations where available.
 
-> "The trend is your friend until the end when it bends." — Ed Seykota
-
 ## Introduction
 
 The Parabolic Stop And Reverse (PSAR) is a trend-following overlay indicator created by J. Welles Wilder Jr. in 1978. It produces a trailing stop level that accelerates toward price as the trend extends, then flips to the opposite side when price crosses the stop. The acceleration mechanism is the key differentiator: SAR starts slow and tightens progressively, creating the characteristic parabolic curve that gives the indicator its name. Default parameters (0.02 start, 0.02 increment, 0.20 maximum) produce approximately 10–30 reversals per 500 bars on typical equity data.