fix: omit empty command flag section in help

Author: thymikee

src/__tests__/cli-help.test.ts

@@ -65,7 +65,7 @@ test('help appstate prints command help and skips daemon dispatch', async () =>
   assert.equal(result.code, 0);
   assert.equal(result.daemonCalls, 0);
   assert.match(result.stdout, /Show foreground app\/activity/);
-  assert.match(result.stdout, /Command flags:\n  \(none\)/);
+  assert.doesNotMatch(result.stdout, /Command flags:/);
   assert.match(result.stdout, /Global flags:/);
 });
 

src/utils/__tests__/args.test.ts

@@ -188,6 +188,6 @@ test('command usage shows no command flags when unsupported', () => {
   const help = usageForCommand('appstate');
   if (help === null) throw new Error('Expected command help text');
   assert.match(help, /Show foreground app\/activity/);
-  assert.match(help, /Command flags:\n  \(none\)/);
+  assert.doesNotMatch(help, /Command flags:/);
   assert.match(help, /Global flags:/);
 });

src/utils/command-schema.ts

@@ -611,6 +611,11 @@ export function buildCommandUsageText(commandName: string): string | null {
   const usage = buildCommandUsage(commandName, schema);
   const commandFlags = listHelpFlags(new Set<FlagKey>(schema.allowedFlags));
   const globalFlags = listHelpFlags(GLOBAL_FLAG_KEYS);
+  const sections: string[] = [];
+  if (commandFlags.length > 0) {
+    sections.push(renderFlagSection('Command flags:', commandFlags));
+  }
+  sections.push(renderFlagSection('Global flags:', globalFlags));
 
   return `agent-device ${usage}
 
@@ -619,8 +624,6 @@ ${schema.description}
 Usage:
   agent-device ${usage}
 
-${renderFlagSection('Command flags:', commandFlags)}
-
-${renderFlagSection('Global flags:', globalFlags)}
+${sections.join('\n\n')}
 `;
 }