feat: add named iteration variable syntax for nested loops

CLAUDE.md

@@ -312,6 +312,19 @@ The library uses a **visitor pattern** for processing Word documents, enabling:
 {{/foreach}}
 ```
 
+**Named iteration variable syntax** (for accessing parent scope in nested loops):
+```
+{{#foreach item in CollectionName}}
+  {{item.PropertyName}}
+{{/foreach}}
+
+{{#foreach category in Categories}}
+  {{#foreach product in category.Products}}
+    {{category.Name}}: {{product.Name}}  ← Access parent loop variable
+  {{/foreach}}
+{{/foreach}}
+```
+
 **Loop metadata:** `{{@index}}`, `{{@first}}`, `{{@last}}`, `{{@count}}`
 
 ### Markdown Syntax

README.md

@@ -23,7 +23,7 @@ Templify is a focused .NET library built on the OpenXML SDK that enables dynamic
 - ✨ Markdown formatting in variable values: `**bold**`, `*italic*`, `~~strikethrough~~`
 - ↩️ Line breaks in variable values: `"Line 1\nLine 2"` renders as separate lines
 - 🔀 Conditional blocks: `{{#if}}...{{#elseif}}...{{#else}}...{{/if}}`
-- 🔁 Loops and iterations: `{{#foreach collection}}...{{/foreach}}`
+- 🔁 Loops and iterations: `{{#foreach collection}}...{{/foreach}}` or `{{#foreach item in collection}}...{{/foreach}}`
 - 🌳 Nested data structures with dot notation and array indexing
 - 🎨 Automatic formatting preservation (bold, italic, fonts, colors)
 - 📊 Full table support including row loops

TriasDev.Templify.Tests/ConditionalEvaluatorTests.cs

@@ -866,7 +866,7 @@ public void Evaluate_DeepNestedPath_InLoopContext_WhenItemHasSamePath_ReturnsTru
 
         object loopContext = Activator.CreateInstance(
             loopContextType,
-            new object[] { firstItem, 0, 1, "data.assets.items", null! })!;
+            new object[] { firstItem, 0, 1, "data.assets.items", null!, null! })!;
 
         IEvaluationContext loopEvalContext = (IEvaluationContext)Activator.CreateInstance(
             loopEvalContextType,