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* Improve proxy target validation in DevUI aggregator Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Fail closed on malformed proxy target URIs Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Add direct coverage for proxy target validation Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Apply arrange-act-assert structure to aggregator tests Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Fix formatting in aggregator tests Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>