IINTS Pico Pump Bench Serial Protocol
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Scope: bench-only, non-actuating firmware.
Baud: 115200
Line ending: newline
Ready banner: IINTS Pico Pump Bench firmware ready

Allowed commands:
- PING
- STATUS
- LOCKOUT

Blocked commands:
- DOSE
- BOLUS
- BASAL
- PRIME

All responses are JSON lines and include:
- ok
- device
- hardware_actuation_enabled
- locked

The firmware must always report hardware_actuation_enabled=false.
