chore(eslint): update shared presets and config exports

configs/eslint/src/presets/regexp.ts

@@ -0,0 +1,18 @@
+import type { FlatConfigArray } from '../types';
+import regexpPlugin from 'eslint-plugin-regexp';
+
+/**
+ * Regular-expression correctness & optimization rules via
+ * [`eslint-plugin-regexp`](https://ota-meshi.github.io/eslint-plugin-regexp/).
+ *
+ * Applies the plugin's flat `recommended` ruleset — catches buggy/ambiguous
+ * patterns (control characters, useless quantifiers, ReDoS-prone constructs)
+ * and pushes toward clearer, faster expressions. Included in {@link base} so it
+ * applies to every package.
+ */
+export const regexp: FlatConfigArray = [
+  {
+    ...regexpPlugin.configs['flat/recommended'],
+    name: 'robonen/regexp',
+  },
+];