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/avgprice/Avgprice.md

@@ -1,5 +1,7 @@
 # AVGPRICE: Average Price
 
+> *The four-point average distills an entire bar into a single representative price — open, high, low, and close in equal measure.*
+
 | Property         | Value                            |
 | ---------------- | -------------------------------- |
 | **Category**     | Core                        |
@@ -62,22 +64,6 @@ $O(1)$ per bar. Two additions, one FMA. No memory allocation. Always hot after t
 | Typical Price | $(H+L+C) \times \frac{1}{3}$ | `HLC3` | `Typprice` |
 | Weighted Close | $(H+L+2C) \times 0.25$ | `HLCC4` | `Wclprice` |
 
-### Pseudo-code
-
-```
-function AVGPRICE(bar):
-    o, h, l, c ← bar.Open, bar.High, bar.Low, bar.Close
-
-    // Substitute last-valid for non-finite inputs
-    if !finite(o): o ← lastValidOpen
-    if !finite(h): h ← lastValidHigh
-    if !finite(l): l ← lastValidLow
-    if !finite(c): c ← lastValidClose
-
-    result ← FMA(o + h, 0.25, (l + c) × 0.25)
-    return result
-```
-
 ### Output Interpretation
 
 | Context | Meaning |