feat: EXPLODE now supports Dimension entities

Decomposes Dimension (Linear, Aligned, Radius, Diameter, Angular2Ln,
Angular3Pt, Ordinate) into constituent Lines (extension lines, dimension
line) plus a Text entity for the dimension label value.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ROADMAP.md

@@ -122,7 +122,7 @@ Underlay (PDF/DWF/DGN)
 | FILLET (F) | 🔧 | LwPolyline desteği yok |
 | CHAMFER (CHA) | ✅ | — |
 | JOIN (J) | ✅ | — |
-| EXPLODE (X) | 🔧 | Dimension eksik |
+| EXPLODE (X) | ✅ | — |
 | PEDIT (PE) | ✅ | — |
 | STRETCH (SS) | ✅ | — |
 | SPLINEDIT | ⬜ | — |
@@ -303,8 +303,7 @@ Underlay (PDF/DWF/DGN)
 
 ### Yüksek Öncelik
 1. **TRIM / EXTEND / OFFSET / BREAK / LENGTHEN → Spline desteği**
-2. **EXPLODE → Dimension desteği**
-3. **FILLET → LwPolyline desteği**
+2. **FILLET → LwPolyline desteği**
 
 ### Orta Öncelik
 5. **Solid3D tessellation** tamamlama (ACIS → truck pipeline)