OT/SCADA physics

First-order lag on PLC_Firmware hosts (netforge_rl/scenarios/ot_physics.py). Ticked after actions, before termination.

x[t+1] = x[t] + (x_sp − x[t]) / τ + N(0, σ)

	Nominal	τ	σ	Alarm	Critical
temperature °C	40–60	20	0.1	> 80	> 120
pressure bar	90–110	10	0.2	>130 or <70	>180 or <30
flow L/min	40–60	5	0.3	>90 or <20	>150 or <5

Alarm → SIEM severity 7. Critical → kinetic_destruction, severity 10, ends ot_stuxnet.

OverloadPLC (id 20, Root on PLC) jumps setpoints. ~10–15 ticks to destruction. IsolateHost stops physics on that PLC.