Fix: handle missing values for options like -s, -f, -o, -l, -d

When options that require values (e.g., -s, -f) are followed by
another flag (e.g., -s -c), the parser set them to boolean true
instead of their expected string value, causing TypeError.

Now these options properly fall back to defaults when no value
is provided.

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

bin/security-lint

@@ -611,17 +611,17 @@ HELP;
         $options = [];
 
         $format = $args['format'] ?? $args['f'] ?? null;
-        if ($format) {
+        if ($format !== null && $format !== true) {
             $options['format'] = $format;
         }
 
         $severity = $args['severity'] ?? $args['s'] ?? null;
-        if ($severity) {
+        if ($severity !== null && $severity !== true) {
             $options['severity'] = $severity;
         }
 
         $output = $args['output'] ?? $args['o'] ?? null;
-        if ($output) {
+        if ($output !== null && $output !== true) {
             $options['output'] = $output;
         }
 
@@ -640,12 +640,12 @@ HELP;
         $options['include'] = $include;
 
         $depth = $args['recursive-depth'] ?? $args['d'] ?? null;
-        if ($depth) {
+        if ($depth !== null && $depth !== true) {
             $options['recursive-depth'] = $depth;
         }
 
         $lang = $args['lang'] ?? $args['l'] ?? null;
-        if ($lang) {
+        if ($lang !== null && $lang !== true) {
             $options['lang'] = $lang;
         }