chore: Add project configuration and documentation

- Kilocode AI agent rules and guidelines
- Setup and implementation guides
- Architecture documentation
- Build and verification references

.kilocode/rules/csharp_50_syntax.md

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+# C# 5.0 Syntax Requirements
+
+You are working on a .NET Framework 4.8 project that MUST use C# 5.0 syntax only.
+
+## Forbidden C# 6+ Features
+
+### String Interpolation (C# 6)
+❌ NEVER use: `$"Order {orderId} at {price}"`
+✅ ALWAYS use: `string.Format("Order {0} at {1}", orderId, price)`
+
+### Null-Conditional Operators (C# 6)
+❌ NEVER use: `var name = order?.Name`
+❌ NEVER use: `var value = dict?[key]`
+✅ ALWAYS use explicit null checks:
+```csharp
+var name = order != null ? order.Name : null;
+if (dict != null && dict.ContainsKey(key)) { }
+```
+
+### Null-Coalescing Assignment (C# 8)
+❌ NEVER use: `value ??= defaultValue;`
+✅ ALWAYS use: `if (value == null) value = defaultValue;`
+
+### Expression-Bodied Members (C# 6)
+❌ NEVER use: `public int Property => value;`
+❌ NEVER use: `public void Method() => DoSomething();`
+✅ ALWAYS use full syntax:
+```csharp
+public int Property 
+{ 
+    get { return value; } 
+}
+
+public void Method()
+{
+    DoSomething();
+}
+```
+
+### nameof Operator (C# 6)
+❌ NEVER use: `throw new ArgumentNullException(nameof(param));`
+✅ ALWAYS use: `throw new ArgumentNullException("param");`
+
+### Auto-Property Initializers (C# 6)
+❌ NEVER use: `public int Property { get; set; } = 10;`
+✅ ALWAYS use constructor initialization:
+```csharp
+public int Property { get; set; }
+
+public ClassName()
+{
+    Property = 10;
+}
+```
+
+### Using Static (C# 6)
+❌ NEVER use: `using static System.Math;`
+✅ ALWAYS use: `System.Math.Floor(...)`
+
+### Tuple Syntax (C# 7)
+❌ NEVER use: `var tuple = (name: "test", value: 1);`
+✅ ALWAYS use: `Tuple<string, int>` or custom classes
+
+### Pattern Matching (C# 7+)
+❌ NEVER use: `if (obj is string str)`
+✅ ALWAYS use: `if (obj is string) { var str = (string)obj; }`
+
+### Local Functions (C# 7)
+❌ NEVER use functions inside methods
+✅ ALWAYS use private methods
+
+### Out Variables (C# 7)
+❌ NEVER use: `if (dict.TryGetValue(key, out var value))`
+✅ ALWAYS use:
+```csharp
+OrderStatus value;
+if (dict.TryGetValue(key, out value))
+{
+    // Use value
+}
+```
+
+## Verification
+After writing ANY code, verify C# 5.0 compliance:
+- No `$` signs except in string literals
+- No `?.` or `?[` operators
+- No `=>` except in lambda expressions
+- No inline variable declarations in out parameters