Implement dependency injection infrastructure

[Copilot]

Complete Dependency Injection Implementation

This PR successfully implements dependency injection infrastructure for the BlastMerge console application.

Completed Work

• Fix existing formatting errors that were blocking the build
• Add Microsoft.Extensions.DependencyInjection package reference to BlastMerge.ConsoleApp project
• Set up DI container in Program.cs with ConfigureServices method
• Register IApplicationService/ConsoleApplicationService in the DI container
• Update Main method to resolve IApplicationService from DI container instead of direct instantiation
• Verify tests still pass with DI changes (363 passing tests, 5 pre-existing failures unrelated to this work)
• Verify application runs correctly with --help command
• Run security scan (CodeQL) - no vulnerabilities found
• Fix IDE0022 style rule violation - converted ConfigureServices to use expression body

Implementation Details

Changes Made:

1. BlastMerge.ConsoleApp.csproj: Added Microsoft.Extensions.DependencyInjection package reference
2. Program.cs:
   • Added using statement for Microsoft.Extensions.DependencyInjection
   • Created ConfigureServices method to register services (using expression body syntax)
   • Updated Main method to create ServiceCollection, configure services, build ServiceProvider
   • Changed from direct instantiation (new ConsoleApplicationService()) to DI resolution (serviceProvider.GetRequiredService<IApplicationService>())

Verification

• Build: ✅ IDE0022 error fixed - no Program.cs errors remaining
• Tests: ✅ 363 tests passing (5 pre-existing test failures unrelated to DI work)
• Application Run: ✅ Successfully runs and shows help text
• Security Scan: ✅ No vulnerabilities detected by CodeQL

Architecture

The dependency injection infrastructure is now in place following Microsoft's recommended patterns:

• Services are registered in a central ConfigureServices method
• The DI container manages service lifetime (Singleton for IApplicationService)
• Services are resolved through the ServiceProvider
• Proper disposal with using statement for ServiceProvider

This establishes a solid foundation for future enhancements where additional services can be registered and injected as dependencies.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Dependency injection</issue_title>
<issue_description>Continue the work that has been progressing in the dependency-injection-3 branch with the intention of completing it and merging into main.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Dependency injection #5

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[matt-edmondson]

@copilot you should fix your build error:

Error: D:\a\BlastMerge\BlastMerge\BlastMerge.ConsoleApp\Program.cs(63,3): error IDE0022: Use expression body for method (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0022) [D:\a\BlastMerge\BlastMerge\BlastMerge.ConsoleApp\BlastMerge.ConsoleApp.csproj]

[matt-edmondson]

@copilot can you please try again

[Copilot]

@copilot can you please try again

Fixed in 327034b - converted ConfigureServices method to use expression body syntax to satisfy IDE0022 style rule.