Description punctuation only, NO PUBLISH. Edit ONLY current existing project jharwinbarrozo/mmbt3906-tp~762. Read actual description. If last character '.', unchanged; otherwise trim trailing whitespace and append one period, preserving everything else. Report ambiguity. Description mutation only; no publishing, docs, new parts, sharing, other metadata/design edits or other threads. Verify saved readback. Return canonical URL, EXACT before/after, changed/already correct/failed, readback verification, zero publish calls. Fully specified single edit; skip skills/todos/acknowledgment.