fix(installer): support BusyBox coverage inventory

tools/verify-greenfield-execution-coverage.sh

@@ -69,8 +69,16 @@ case "$mode" in
     trap cleanup EXIT
 
     expected_names > "$expected_file"
-    find "$run_dir" -mindepth 1 -maxdepth 1 -type f -name '*.ran' -printf '%f\n' \
-      | sed 's/\.ran$//' | LC_ALL=C sort -u > "$actual_file"
+    [[ -r "$run_dir" && -x "$run_dir" ]] \
+      || { echo "[fixture-suite] coverage state is not readable: $run_dir" >&2; exit 1; }
+    (
+      shopt -s nullglob dotglob
+      for marker in "$run_dir"/*.ran; do
+        [[ -f "$marker" && ! -L "$marker" ]] || continue
+        marker_name="${marker##*/}"
+        printf '%s\n' "${marker_name%.ran}"
+      done
+    ) | LC_ALL=C sort -u > "$actual_file"
 
     defined="$(wc -l < "$expected_file" | tr -d ' ')"
     executed="$(wc -l < "$actual_file" | tr -d ' ')"