LangGraph's `interrupt()` now takes a response_schema.

PR #8886, in 1.2.12, accepts a JSON Schema dict, Pydantic model, TypedDict or dataclass. Pydantic-style types validate on resume and an invalid value raises from the node before it commits. Studio renders a typed form instead of a free-form JSON box. That closes the gap where a malformed approval payload flowed straight into downstream state. Default is None, so existing graphs are unaffected.