* feat: make embedding_config optional on agent creation - Remove requirement for embedding_config in agent creation - Add EmbeddingConfigRequiredError for operations that need embeddings - Add null checks in sleeptime agent creation, passage insert, archive creation - Register new error in app.py exception handlers 🐾 Generated with [Letta Code](https://letta.com) Co-Authored-By: Letta <noreply@letta.com> * chore: update API schemas for optional embedding_config 🐾 Generated with [Letta Code](https://letta.com) Co-Authored-By: Letta <noreply@letta.com> --------- Co-authored-by: Letta <noreply@letta.com>