chore: patch release (#225)

* chore: add minor changeset for v0.15 release

* chore: change changeset to patch release

---------

Co-authored-by: ctate <366502+ctate@users.noreply.github.com>

.changeset/v0-15-release.md

@@ -0,0 +1,9 @@
+---
+"@json-render/core": patch
+---
+
+Add yaml format support to `buildUserPrompt`
+
+### New:
+
+- `buildUserPrompt` now accepts `format` and `serializer` options, enabling YAML as a wire format alongside JSON