Add comprehensive XML documentation for IDE IntelliSense support

[Copilot]

Summary

This PR adds comprehensive XML documentation to all public APIs in the DendroDocs.Client library and enables XML documentation file generation for NuGet packages, providing full IDE IntelliSense support for developers.

Changes Made

🔧 Project Configuration

• Added <GenerateDocumentationFile>true</GenerateDocumentationFile> to enable XML documentation generation
• XML documentation file is now automatically included in NuGet packages

📚 Documentation Added

Added comprehensive XML documentation to all 6 extension classes covering 19 public methods:

• StringExtensions (5 methods): Type analysis and formatting utilities

  • IsEnumerable() - Detects enumerable collection types
  • IsGeneric() - Identifies generic types
  • GenericTypes() - Extracts generic type arguments
  • ForDiagram() - Formats type names for diagram display
  • ToSentenceCase() - Converts strings to sentence case

• IEnumerableTypeDescriptionExtensions (8 methods): Core type analysis functionality

  • First() / FirstOrDefault() - Type lookup by name
  • GetInvokedMethod() - Method invocation matching
  • GetInvocationConsequences() - Call chain tracing
  • GetInvocationConsequenceStatements() - Statement analysis
  • TraverseStatement() - Complex statement expansion
  • PopulateInheritedBaseTypes() - Inheritance hierarchy building
  • PopulateInheritedMembers() - Member inheritance

• InvocationDescriptionExtensions (2 methods): Method invocation analysis

• IEnumerableMethodDescriptionExtensions (1 method): Method filtering

• IEnumerableIAttributeDescriptionExtensions (2 methods): Attribute analysis

• IEnumerableStringExtensions (1 method): String collection utilities

📖 Documentation Features

• Clear method summaries explaining purpose and behavior
• Parameter documentation with detailed descriptions
• Return value documentation explaining what methods return
• Exception documentation for ArgumentNullException cases
• Usage examples for complex methods demonstrating practical usage
• Class-level documentation explaining the purpose of each extension class

Example Usage

With the new documentation, developers now see helpful IntelliSense when using the library:

using DendroDocs.Extensions;

// IntelliSense now shows: "Formats a type name for display in diagrams..."
var diagramName = "System.Collections.Generic.List<System.String>".ForDiagram();
// Returns: "List<String>"

// IntelliSense shows: "Finds the first type description with the specified full name..."
var myType = types.FirstOrDefault("MyNamespace.MyClass");

Testing

• ✅ All 135 existing tests pass
• ✅ No breaking changes to existing functionality
• ✅ XML documentation file (15.9KB) generated successfully
• ✅ Documentation included in NuGet package verification

Impact

• Enhanced developer experience with rich IDE IntelliSense support
• Professional documentation standards following C# XML documentation conventions
• Better API discoverability helping developers understand how to use extension methods
• NuGet package improvement with documentation files included for offline reference

Fixes #11.

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[coveralls]

Pull Request Test Coverage Report for Build 15992176918

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 15928098122:	0.0%
Covered Lines:	221
Relevant Lines:	221

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💛 - Coveralls