### Changes:
- Introduced the `import-sparse` command in `src/cli.ts`:
- Allows importing sparse data from a JSON file into the database.
- Includes an option (`--clear`) to clear existing data before import.
- Displays counts of imported nouns and verbs upon successful completion.
- Updated CLI help and autocompletion configuration to support the new command.
### Purpose:
Enhanced the CLI by adding `import-sparse`, providing users with the ability to efficiently import sparse data into the database. This addition aligns with the application's functionality for managing sparse data operations.