* feat: add pagination to agent blocks endpoint
* chore: regenerate API client with pagination parameters
* feat: implement pagination logic in list_blocks endpoint
- Fix list_blocks implementation to use pagination parameters that were already in the route signature
- Add in-memory pagination logic for core memory blocks (sorting, cursor filtering, limit)
- Sort blocks by created_at timestamp with proper asc/desc ordering
- Apply cursor-based pagination with before/after filters
- Apply limit to results
- Regenerate API client code to reflect pagination functionality
* fix: correct sorting logic in list_blocks endpoint
- Fix AttributeError where blocks don't have created_at attribute
- Sort blocks by id instead of created_at (core memory blocks don't have timestamps)
- Maintains consistent pagination behavior while fixing runtime error
* feat: implement database-level pagination for list_blocks endpoint
- Replace inefficient in-memory filtering with proper SQLAlchemy query
- Use BlocksAgents join table to filter blocks by agent_id at database level
- Apply pagination filters (before, after, limit) in SQL query for better performance
- Sort by BlockModel.created_at instead of in-memory sorting
- Add necessary imports: select from sqlalchemy, db_registry from letta.server.db
- Verify agent access before querying blocks
* refactor: move database logic from route to agent manager service layer
- Add list_agent_blocks_async method to AgentManager for proper separation of concerns
- Move SQLAlchemy query logic from REST route to service layer
- Keep routes focused on request/response handling
- Remove unnecessary imports from router (select, db_registry)
- Database pagination logic now properly encapsulated in service layer
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