fix: mentor skill review round 1

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

tools/test/mentor.test.mjs

@@ -1,6 +1,6 @@
 import { test } from "node:test";
 import assert from "node:assert/strict";
-import { readFileSync } from "node:fs";
+import { readFileSync, existsSync } from "node:fs";
 import { join, dirname } from "node:path";
 import { fileURLToPath } from "node:url";
 
@@ -29,3 +29,9 @@ test("mentor_skill_names_no_module_specific_cards", () => {
     .map((n) => n.name);
   assert.deepEqual(hits, []);
 });
+
+test("mentor_skill_tool_paths_exist", () => {
+  const paths = [...skill.matchAll(/tools\/([\w-]+\.mjs)/g)].map((m) => m[1]);
+  assert.ok(paths.length >= 3);
+  for (const p of paths) assert.ok(existsSync(join(root, "tools", p)), p);
+});