- Introduced a new `sessions.py` module for handling session persistence using SQLite.
- Added CRUD operations for threads, including listing, checking existence, finding similar threads, and deleting threads.
- Enhanced the interactive CLI to support commands for managing sessions: `/current`, `/threads`, `/resume`, and `/delete`.
- Updated the `cmd_interactive` function to handle session metadata and improve user experience with session history rendering.
- Modified the streaming functions to include metadata for checkpoint persistence.
- Added unit tests for session management functionalities to ensure reliability and correctness.
X-iZhang