- Add a new NodeConnection utility that validates inputs, tests /api/health endpoints, normalizes URLs, and classifies connection failures
- Add CentralCore methods to test node connectivity and connect/register remote nodes, with duplicate-name checks and node:connection:test event emission
- Export NodeConnection types and APIs from @fusion/core for external consumers
- Add comprehensive unit coverage for NodeConnection and CentralCore connection flows, and increase dashboard assignment test setup timeout to reduce build/test flakiness
