GHSA-3644-q5cj-c5c7: LangSmith SDK: Public prompt pull deserializes untrusted manifests without trust boundary warning

LangSmith SDK (a tool for managing prompts in LangChain applications) had a vulnerability where pulling public prompts by owner/name would deserialize (convert from stored format into executable code) untrusted manifest files without warning users about the trust risk. An attacker could publish a malicious prompt that, when pulled and deserialized, would execute with attacker-controlled settings, potentially redirecting API requests to steal secrets or injecting malicious instructions into the AI's behavior.