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/roofing/Roofing.md

@@ -1,5 +1,7 @@
 # ROOFING: Ehlers Roofing Filter
 
+> *The trend is your friend until it overwhelms the signal. The noise is your enemy until you mistake it for alpha.*
+
 | Property         | Value                            |
 | ---------------- | -------------------------------- |
 | **Category**     | Filter                        |
@@ -16,8 +18,6 @@
 - Requires `hpLength` bars of warmup before first valid output (IsHot = true). Default: **48 bars**.
 - Validated against TA-Lib, Skender, and Tulip reference implementations where available.
 
-> "The trend is your friend until it overwhelms the signal. The noise is your enemy until you mistake it for alpha."
-
 The **Roofing Filter** is John Ehlers' bandpass architecture designed specifically for oscillator construction. It cascades a 2nd-order Butterworth Highpass (to strip trend) with a Super Smoother Lowpass (to strip noise), passing only the cyclic energy within a user-defined frequency band. The output oscillates around zero, with zero crossings serving as directional signals.
 
 ## Historical Context