* feat: add ID format validation to identity schemas
Add ID format validation to IdentityCreate, IdentityUpsert, and IdentityUpdate
schemas using existing validator types from letta.validators.
Changes:
- agent_ids: Optional[List[str]] → Optional[List[AgentId]]
- block_ids: Optional[List[str]] → Optional[List[BlockId]]
This ensures malformed IDs are rejected with 422 validation errors instead
of causing 500 database errors.
🤖 Generated with [Letta Code](https://letta.com)
Co-Authored-By: Letta <noreply@letta.com>
* chore: regenerate API spec and SDK
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Co-authored-by: Letta <noreply@letta.com>
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