refactor: remove legacy config and state aliases (PR5)

src/data-state-files.ts

@@ -0,0 +1,27 @@
+import fs from 'fs';
+import path from 'path';
+
+const ALLOWED_DATA_JSON_PATTERNS = [
+  /^token-rotation-state\.json$/,
+  /^codex-rotation-state\.json$/,
+  /^claude-usage-cache\.json$/,
+  /^restart-context\..+\.json$/,
+];
+
+function isAllowedDataStateJson(filename: string): boolean {
+  return ALLOWED_DATA_JSON_PATTERNS.some((pattern) => pattern.test(filename));
+}
+
+export function listUnexpectedDataStateFiles(dataDir: string): string[] {
+  if (!fs.existsSync(dataDir)) {
+    return [];
+  }
+
+  return fs
+    .readdirSync(dataDir, { withFileTypes: true })
+    .filter((entry) => entry.isFile())
+    .map((entry) => entry.name)
+    .filter((filename) => path.extname(filename) === '.json')
+    .filter((filename) => !isAllowedDataStateJson(filename))
+    .sort();
+}