> cargo run network health --network=local
❌ Unhealthy
❌ failed to fetch network health: Networking or low-level protocol error: HTTP error: error trying to connect: tcp connect error: Connection refused (os error 111)
> cargo run network health              
✅ Healthy
ℹ️ Latest ledger: 104038
> cargo run network health --output json-formatted
{
  "status": "healthy",
  "latestLedger": 104044,
  "oldestLedger": 256,
  "ledgerRetentionWindow": 120960
}