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/core/midbody/Midbody.md

@@ -1,5 +1,7 @@
 # MIDBODY: Open-Close Average
 
+> *The average of open and close reveals the candle body's center — where intent met execution.*
+
 | Property         | Value                            |
 | ---------------- | -------------------------------- |
 | **Category**     | Core                        |
@@ -70,13 +72,6 @@ None. OC2 is parameterless.
 | AVGPRICE | $(O+H+L+C) \times 0.25$ | O, H, L, C | Fully balanced |
 | WCLPRICE | $(H+L+2C) \times 0.25$ | H, L, C | Close double-weighted |
 
-### Pseudo-code
-
-```text
-function Midbody(bar):
-    return (bar.Open + bar.Close) * 0.5
-```
-
 ### Output Interpretation
 
 - OC2 > Close: bar closed below its midpoint (bearish lean)
@@ -119,9 +114,3 @@ The batch loop is a trivial element-wise `(a[i] + b[i]) * 0.5`. Auto-vectorizati
 
 - **Skender.Stock.Indicators** `CandlePart.OC2` enum documentation.
 - **Murphy, J.J.** *Technical Analysis of the Financial Markets*. New York Institute of Finance, 1999.
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