[StuartFerguson]

Summary

• Add the standalone TransactionProcessing.ApiDefaults package for Minimal API versioning, OpenAPI, Scalar, and version fallback handlers.
• Add a runnable sample and integration coverage for versioned routing, fallback behavior, OpenAPI documents, and Scalar.
• Add the package to release publishing and run its tests on pull requests.

Verification

• dotnet build Shared.sln --configuration Release
• dotnet test TransactionProcessing.ApiDefaults.Tests/TransactionProcessing.ApiDefaults.Tests.csproj --configuration Release (8 passed)
• dotnet pack TransactionProcessing.ApiDefaults/TransactionProcessing.ApiDefaults.csproj --configuration Release --no-build

NuGet vulnerability audit requests emitted NU1900 because api.nuget.org was unreachable in this environment.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-19T13:56:28.632127Z	82b39b8	PR opened

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 30 complexity · 0 duplication

Metric	Results
Complexity	30
Duplication	0

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