Add focused regression tests for one small code path

Delivery is one Markdown test note plus a patch or diff. It must state the behavior under test; identify the existing test runner and exact command; add at least three meaningful cases including one failure or boundary case; avoid network dependence unless explicitly part of the supplied public fixture; and include the observed test output. Existing failures must be separated from failures introduced by the patch. If the project cannot be executed from the supplied material, return a blocker report and still provide a clearly labeled unexecuted patch only when it can be derived safely.