fix(ci): widen manifest extension filter to .yaml and .yml

Mirror src/core/manifest/load-manifest.ts so the website snapshot
can't drift from the runtime tool list if a .yml manifest is ever
added. Addresses Cursor Bugbot review on #372.

Author: cameroncooke

scripts/build-website-manifest.mjs

@@ -45,7 +45,7 @@ function usage() {
 }
 
 async function loadYamlDir(dir) {
-  const entries = (await readdir(dir)).filter((f) => f.endsWith(".yaml"));
+  const entries = (await readdir(dir)).filter((f) => f.endsWith(".yaml") || f.endsWith(".yml"));
   return Promise.all(
     entries.map(async (f) => parseYaml(await readFile(path.join(dir, f), "utf8"))),
   );