Fix cross-platform path separators in walker

Normalize paths to forward slashes so walker snapshot
passes on both Windows and Linux (CI).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Ghost---Shadow

src/walker.js

@@ -16,7 +16,7 @@ const checkIfFileShouldBeIgnored = (fullPath) => {
 const walk = (rootDir, allFiles = []) => {
   const files = fs.readdirSync(rootDir);
   files.forEach((file) => {
-    const fullPath = path.join(rootDir, file);
+    const fullPath = path.join(rootDir, file).split(path.sep).join('/');
     if (fs.statSync(fullPath).isDirectory()) {
       if (!checkIfDirectoryShouldBeIgnored(fullPath)) {
         walk(fullPath, allFiles);

test/__snapshots__/walker.spec.js.snap

@@ -2,9 +2,9 @@
 
 exports[`walker walk should return list of all files in directory 1`] = `
 [
-  "test\\walking_test\\a.js",
-  "test\\walking_test\\directory\\b.jsx",
-  "test\\walking_test\\directory\\e.tsx",
-  "test\\walking_test\\f.ts",
+  "test/walking_test/a.js",
+  "test/walking_test/directory/b.jsx",
+  "test/walking_test/directory/e.tsx",
+  "test/walking_test/f.ts",
 ]
 `;