Edit ONLY this existing project jharwinbarrozo/xp3n028en~2cv. Read actual project description. Preserve all text: if already ends '.', unchanged; otherwise trim trailing whitespace and append exactly one period. Report ambiguity. Use description mutation only, no other metadata/design/docs/sharing/new parts/publishing. Verify saved description by readback. Fully specified single edit: no skills/docs needed. Return canonical URL, exact before and after descriptions, changed/already correct/failed, readback verification and zero publish calls. Do not dispatch other threads.