init: add source code from src.zip

src/utils/yaml.ts

@@ -0,0 +1,15 @@
+/**
+ * YAML parsing wrapper.
+ *
+ * Uses Bun.YAML (built-in, zero-cost) when running under Bun, otherwise falls
+ * back to the `yaml` npm package. The package is lazy-required inside the
+ * non-Bun branch so native Bun builds never load the ~270KB yaml parser.
+ */
+
+export function parseYaml(input: string): unknown {
+  if (typeof Bun !== 'undefined') {
+    return Bun.YAML.parse(input)
+  }
+  // eslint-disable-next-line @typescript-eslint/no-require-imports
+  return (require('yaml') as typeof import('yaml')).parse(input)
+}