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Cover build_execution_registry, case-insensitive lookups, unknown name handling, MirroredCommand/MirroredTool attributes, empty registry behavior, and PORTED_COMMANDS/PORTED_TOOLS count matching. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Co-authored-by: abdoelsayed2016 <27821589+abdoelsayed2016@users.noreply.github.com>