Add Connection Pooling and Session Management

Optimize SSH connections by reusing them across multiple operations instead of creating new connections each time. Add health checks to detect broken connections and automatic failover to backup systems.

No files, tests, or entry points are named. Start by locating where SSH connections are created and operations are managed; done means connections are reused, broken connections are detected, and failover to backup systems works.

Written by the indexing model from the issue text.