fix(core): read backslashes as separators in globParent

`fs.globSync` reads backslashes as path separators, never as escapes, on
every platform, so `doc\api\*.md` finds `doc/api`'s files, but
`globParent` only split on `/` and returned `.` for it. glob-parent
converted backslashes on Windows, so this matches it again.

Also covers `?` (glob syntax, which glob-parent missed) and `(b|c)`
(matched literally by `fs.globSync`, which glob-parent treated as glob).

Assisted-by: Claude Opus 5.5 <noreply@anthropic.com>

Author: ovflowd

packages/core/src/utils/__tests__/glob.test.mjs

@@ -62,6 +62,17 @@ describe('globParent', () => {
     assert.strictEqual(globParent('a/{b,c}/*.md'), 'a');
     assert.strictEqual(globParent('a/b/[x-y]*.md'), 'a/b');
     assert.strictEqual(globParent('a/+(b|c)/*.md'), 'a');
+    assert.strictEqual(globParent('a/b?d/*.md'), 'a');
+  });
+
+  it('should treat as plain what fs.globSync matches literally', () => {
+    assert.strictEqual(globParent('a/(b|c)/*.md'), 'a/(b|c)');
+    assert.strictEqual(globParent('a/b+c/*.md'), 'a/b+c');
+  });
+
+  it('should read backslashes as separators, like fs.globSync', () => {
+    assert.strictEqual(globParent('doc\\api\\*.md'), 'doc/api');
+    assert.strictEqual(globParent('C:\\docs\\*.md'), 'C:/docs');
   });
 
   it('should return the parent directory of a plain path', () => {

packages/core/src/utils/glob.mjs

@@ -28,14 +28,15 @@ export const findFiles = (patterns, { cwd = process.cwd(), ignore } = {}) => {
 /**
  * Returns the directory part of a glob pattern before its first glob segment,
  * e.g. `doc/api` for `doc/api/*.md`, or the parent directory of a plain path.
+ * Like `fs.globSync`, it reads backslashes as separators, never as escapes.
  *
- * @param {string} pattern - A glob pattern with POSIX separators
+ * @param {string} pattern - A glob pattern
  * @returns {string}
  */
 export const globParent = pattern => {
-  const segments = pattern.split('/');
+  const segments = pattern.replaceAll('\\', '/').split('/');
   const index = segments.findIndex(segment => GLOB_SEGMENT.test(segment));
   const parent = segments.slice(0, index === -1 ? -1 : index).join('/');
 
-  return parent || (pattern.startsWith('/') ? '/' : '.');
+  return parent || (segments[0] === '' ? '/' : '.');
 };