Fix trace eraser temp file bug

Changes:
- Calculate lines removed before deleting temp files
- Add error handling to line count calculations
- Prevent 'No such file or directory' error on line 163

Tested:
✓ Pattern-based removal works correctly
✓ Removes toolkit entries regardless of position
✓ No temp file access errors

tools/erase-toolkit-traces.sh

@@ -148,17 +148,25 @@ if [ "$CLEAN_HISTORY" = true ] && [ -f ~/.bash_history ]; then
     # Disable history recording for this session to prevent re-adding commands
     set +o history
 
-    # Remove last 10 lines from history file (covers toolkit download/usage)
-    total_lines=$(wc -l < ~/.bash_history)
-    if [ "$total_lines" -gt 10 ]; then
-        lines_to_keep=$((total_lines - 10))
-        head -n "$lines_to_keep" ~/.bash_history > ~/.bash_history.tmp
-        mv ~/.bash_history.tmp ~/.bash_history
-        echo "  ✓ Removed last 10 history entries"
-    else
-        > ~/.bash_history
-        echo "  ✓ Cleared entire history (had < 10 entries)"
-    fi
+    # Remove toolkit-related entries from history file
+    cp ~/.bash_history ~/.bash_history.tmp
+
+    # Remove lines containing toolkit-related patterns
+    grep -v "git.mull.lol" ~/.bash_history.tmp > ~/.bash_history.tmp2 2>/dev/null || true
+    grep -v "linux-server-management-toolkit" ~/.bash_history.tmp2 > ~/.bash_history.tmp3 2>/dev/null || true
+    grep -v "server-toolkit" ~/.bash_history.tmp3 > ~/.bash_history.tmp4 2>/dev/null || true
+    grep -v "launcher.sh" ~/.bash_history.tmp4 > ~/.bash_history.tmp5 2>/dev/null || true
+    grep -v "erase-toolkit-traces" ~/.bash_history.tmp5 > ~/.bash_history 2>/dev/null || true
+
+    # Calculate lines removed before deleting temp files
+    lines_before=$(wc -l < ~/.bash_history.tmp 2>/dev/null || echo 0)
+    lines_after=$(wc -l < ~/.bash_history 2>/dev/null || echo 0)
+    lines_removed=$((lines_before - lines_after))
+
+    # Clean up temp files
+    rm -f ~/.bash_history.tmp*
+
+    echo "  ✓ Removed $lines_removed toolkit-related history entries"
 
     # Clear in-memory history completely
     history -c