[WIP] Update .NET build and test steps to avoid duplicate compilation

[Codex]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

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This section details on the original issue you should resolve

<issue_title>Phase 1: Align .NET build and test steps to avoid duplicate compilation</issue_title>
<issue_description>## Summary
Update the GitHub Actions workflow so .NET is restored once, built once in Release, and tested with --no-build.

Change

Replace the current backend sequence with:

• dotnet restore
• dotnet build --configuration Release --no-restore
• dotnet test --configuration Release --no-build

Why

Recent analysis indicates the workflow likely rebuilds because build and test configurations are misaligned. This is the lowest-risk first improvement.

Acceptance criteria

• Backend workflow uses a single Release build
• Tests run with --no-build
• CI remains green
• Timing before and after is captured for comparison</issue_description>

Comments on the Issue (you are @codex[agent] in this section)

[Copilot]

Pull request overview

Updates the GitHub Actions workflow’s .NET build/test sequence to align configurations and prevent dotnet test from triggering an additional compilation, improving CI efficiency for the backend portion of the pipeline.

Changes:

• Build step now uses dotnet build --configuration Release --no-restore.
• Test step now uses dotnet test --configuration Release --no-build.

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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

[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

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