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/loess/Loess.md

@@ -1,5 +1,7 @@
 # Loess: Locally Estimated Scatterplot Smoothing
 
+> *When global models fail, act locally. LOESS fits the data by ignoring the noise and embracing the neighborhood.*
+
 | Property         | Value                            |
 | ---------------- | -------------------------------- |
 | **Category**     | Filter                        |
@@ -17,8 +19,6 @@
 - Requires `Period` bars of warmup before first valid output (IsHot = true).
 - Validated against TA-Lib, Skender, and Tulip reference implementations where available.
 
-> "When global models fail, act locally. LOESS fits the data by ignoring the noise and embracing the neighborhood."
-
 Locally Estimated Scatterplot Smoothing (LOESS) applies a weighted linear regression over a localized window of nearest neighbors. Unlike simple averaging or global linear regression, LOESS estimates the deterministic trend point-by-point, giving maximum influence to recent data and decaying elegantly at the edges.
 
 ## Historical Context / The Standard