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/momentum/macd/Macd.md

@@ -1,5 +1,7 @@
 # MACD: Moving Average Convergence Divergence
 
+> *The trend is your friend, until it bends.*
+
 | Property         | Value                            |
 | ---------------- | -------------------------------- |
 | **Category**     | Momentum                        |
@@ -16,8 +18,6 @@
 - Requires `Max(fast, slow) + signal - 2` bars (33 default) 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 it bends." — Ed Seykota
-
 The Moving Average Convergence Divergence measures momentum through the relationship between two exponential moving averages. Created by Gerald Appel in 1979, the indicator transforms price into a bounded oscillator that reveals trend strength, direction, and potential reversals. Standard parameters (12, 26, 9) detect monthly and biweekly cycles: the 26-period represents roughly one trading month, the 12-period half that duration.
 
 ## Historical Context