DeepSeek Harness Plugin: dsh-wsl-db (Read-Only psql and redis-cli Probes)

The DeepSeek Harness plugin `dsh-wsl-db` provides read-only database probing capabilities for WSL environments, supporting PostgreSQL and Redis. The plugin wraps commonly used CLI commands such as `db_psql` and `db_redis`, and offers status checks and connection management. Installation requires manual command execution, while configuration requires specifying a `redisHosts` whitelist. The plugin is designed in read-only mode, suitable for data querying and analysis.