chore(clean): reduce noisy clean output messages

- remove redundant project cache scanning line

- align xcode runtime empty result message to already clean

lib/clean/caches.sh

@@ -149,7 +149,6 @@ clean_project_caches() {
         fi
         [[ "$has_dev_projects" == "false" ]] && return 0
     fi
-    echo -e "  ${GRAY}${ICON_LIST}${NC} Project caches · scanning for Next.js/Python/Flutter artifacts"
     if [[ -t 1 ]]; then
         MOLE_SPINNER_PREFIX="  "
         start_inline_spinner "Searching project caches..."