[StuartFerguson]

Summary

• Add file-level schema/content validation for Safaricom and Voucher imports.
• Reject invalid files before any transaction events are dispatched.
• Record duplicate rows with DuplicateFileLineAddedEvent without downstream processing.
• Add structured validation diagnostics and automated coverage.

Testing

• dotnet build FileProcessor.sln --no-restore — passed.
• BusinessLogic tests — 120 passed.
• FileAggregate tests — 27 passed.
• Full integration tests require Docker, which was unavailable in the development environment.

Closes #797

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-16T14:54:24.456268Z	18d857c	PR opened

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 29 complexity · 0 duplication

Metric	Results
Complexity	29
Duplication	0

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[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 18d857c4e4

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