Replace bc with awk for floating point comparison

Use awk BEGIN block for comparing Ceph OSD reweight values instead
of bc. Awk is more universally available and the previous fallback
to "echo 0" could incorrectly evaluate to true.

Fixes: #4

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

driveAtlas.sh

@@ -486,7 +486,8 @@ for bay in $(printf '%s\n' "${!DRIVE_MAP[@]}" | grep -E '^[0-9]+$' | sort -n); d
             [[ -z "$reweight" ]] && reweight="0"
 
             # Determine in/out based on reweight (1.0 = in, 0 = out)
-            if (( $(echo "$reweight > 0" | bc -l 2>/dev/null || echo 0) )); then
+            # Use awk for floating point comparison (more portable than bc)
+            if awk "BEGIN {exit !($reweight > 0)}"; then
                 in_status="in"
             else
                 in_status="out"