Network: ping, traceroute

`ping`

Sends a ping to a specific node and measures the round-trip time by waiting for an ACK.

# Ping by node ID
mttctl ping --dest 04e1c43b

# Ping by name
mttctl ping --to Pedro

# Custom timeout (default: 30s)
mttctl ping --dest 04e1c43b --timeout 60

Option	Description
`--dest`	Destination node ID in hex, `!` prefix optional (required unless `--to` is used)
`--to`	Destination node name (required unless `--dest` is used)
`--timeout`	Seconds to wait for ACK (default: 30)

Example output:

-> Pinging !04e1c43b (Pedro) (packet id: a1b2c3d4)...
ok ACK from !04e1c43b (Pedro) in 2.3s

If the node doesn't respond:

-> Pinging !04e1c43b (Pedro) (packet id: a1b2c3d4)...
x Timeout after 30s -- no ACK from !04e1c43b (Pedro)

`traceroute`

Traces the route to a destination node, showing each hop along the path with SNR (signal-to-noise ratio) values.

# Traceroute by node ID
mttctl traceroute --dest 04e1c43b

# Traceroute by name
mttctl traceroute --to Pedro

# Custom timeout (default: 60s)
mttctl traceroute --dest 04e1c43b --timeout 120

Option	Description
`--dest`	Destination node ID in hex, `!` prefix optional (required unless `--to` is used)
`--to`	Destination node name (required unless `--dest` is used)
`--timeout`	Seconds to wait for response (default: 60)

Example output:

-> Tracing route to Pedro (!04e1c43b)...

  1 !a1b2c3d4 (Local)
  2 !e5f6a7b8 (Relay-1)     SNR: 6.0 dB
  3 !04e1c43b (Pedro)        SNR: 8.5 dB

ok Route to Pedro (!04e1c43b) completed in 4.2s (2 hops)

If a return path differs from the forward path, both are shown separately.