fix: improve import skills help output

Author: ymkiux

cli.js

@@ -6513,6 +6513,7 @@ async function cmdDoctor(argv = []) {
             ? renderDoctorMarkdown(report)
             : JSON.stringify(report, null, 2);
         if (options.output) {
+            ensureDir(path.dirname(options.output));
             fs.writeFileSync(options.output, text);
         } else {
             process.stdout.write(text + '\n');

tests/unit/import-skills-url.test.mjs

@@ -2,7 +2,7 @@ import assert from 'assert';
 import { createRequire } from 'module';
 
 const require = createRequire(import.meta.url);
-const { resolveGithubArchiveZipUrl } = require('../../cli/import-skills-url');
+const { resolveGithubArchiveZipUrl, cmdImportSkills } = require('../../cli/import-skills-url');
 
 assert.equal(
     resolveGithubArchiveZipUrl('https://github.com/foo/bar'),
@@ -23,3 +23,12 @@ assert.equal(
 assert.equal(resolveGithubArchiveZipUrl('https://example.com/foo/bar.zip'), '');
 assert.equal(resolveGithubArchiveZipUrl('not a url'), '');
 
+let captured = '';
+const originalWrite = process.stdout.write;
+process.stdout.write = (chunk) => {
+    captured += String(chunk || '');
+    return true;
+};
+await cmdImportSkills(['--help']);
+process.stdout.write = originalWrite;
+assert.ok(captured.includes('codexmate import-skills'));