Add comprehensive C# code references to BDD wiki documentation

[Copilot]

The wiki documentation was showing BDD scenarios line-by-line but lacked understanding of how the actual C# code works. This made it difficult for developers to understand the relationship between business requirements (BDD) and their technical implementations (C#).

What was enhanced

Before

Wikis only showed BDD scenarios like:

Given I have a security token service running with 10000 message renewal interval
When I process 1000000 messages  
Then security tokens should be renewed exactly 100 times

Developers had no visibility into the actual C# implementation, making it confusing to understand how these scenarios translate to working code.

After

Each BDD scenario now includes complete C# implementations:

🔧 C# Step Definition:

[Given(@"I have a security token service running with (\d+) message renewal interval")]
public void GivenIHaveASecurityTokenServiceRunningWithMessageRenewalInterval(int renewalInterval)
{
    _tokenManager.Initialize("test-token-initial", renewalInterval);
}

🏗️ Core Implementation:

public class SecurityTokenManager
{
    private readonly SemaphoreSlim _renewalLock = new(1, 1);
    
    public async Task<string> GetTokenAsync()
    {
        // Thread-safe token renewal logic with exactly-once semantics
    }
}

Files enhanced

• Complex Logic Stress Tests - Added comprehensive C# step definitions, SecurityTokenManager, HTTP endpoint implementations, and complete BDD-to-C# mapping examples
• Stress Tests Overview - Added C# implementations for FIFO processing, message verification, and performance validation with FlinkJobBuilder usage examples
• Getting Started - Enhanced testing section with BDD framework explanation, complete mapping examples, and debugging guidance
• Reliability Tests Overview - Added fault tolerance implementations, Dead Letter Queue processing, and retry mechanism examples

Key improvements

• Bidirectional Understanding: Developers can see both business requirements (BDD) and technical implementation (C#)
• File Path References: Direct links to actual source files for easy navigation
• Complete Examples: Working code that developers can use immediately
• Architecture Guidance: Shows how BDD scenarios translate to FlinkJobBuilder API calls
• Developer Experience: Clear debugging guidance and test execution commands

The documentation now serves as both specification and implementation guide, eliminating confusion about how BDD scenarios map to actual working C# code.

Fixes #7.

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