A mutant fitting to the first line only survived because every other point lay inside it. Builds.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Engine-free rule in ServerShared with five behaviour tests. Builds (ServerShared and tests only; Editor wiring follows in the next commit).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>