[WIP] Fix failing GitHub Actions job for Debian Testing source package

[Copilot]

• Inspect failing workflow run and job logs for "Debian Testing source package"
• Identify root cause in repository files and implement the smallest possible fix
• Add or adjust focused tests/checks if test infrastructure exists for the changed area
• Run targeted validation commands to confirm the fix locally
• Run parallel validation (Code Review + CodeQL), address any valid findings, and summarize results

[CLAassistant]

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