Fix coolant demand to increase when outlet overheats

CONTEXT_NOTES.md

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+# Session Context Notes
+
+- Reactor model: two-loop but tuned to RBMK-like pressures (nominal ~7 MPa for both loops). Loop pressure clamps to saturation baseline when pumps are off; pumps ramp flow/pressure over spool time when stopping or starting.
+- Turbines: produce zero output unless steam quality is present and effective steam flow is >10 kg/s. Steam pressure shown on dashboard only when quality ≥0.05 and flow ≥100 kg/s; otherwise 0 MPa. Steam supply displayed in Turbine panel.
+- Generators: two diesel units, rated 50 MW, spool time 10s. Auto mode default `False`; manual toggles b/v. Auto stops when no load. Relief valves toggles l (primary) / ; (secondary) and displayed per loop.
+- Pumps: per-unit controls g/h (primary), j/k (secondary). Flow/pressure ramp down over spool when pumps stop. Pump status thresholds use >0.1 kg/s to show STOPPING.
+- Maintenance hotkeys: p (core, requires shutdown), m/n (primary 1/2), ,/. (secondary 1/2), B/V (generator 1/2), y/u/i (turbine 1/2/3).
+- Dashboard: two-column layout, trends panel for fuel temp and core power (delta and rate). Power Stats show aux demand/supply, generator and turbine output. Steam supply pressure shown in turbine panel. Core/temp/power lines include nominal/max.
+- Thermal updates: primary/secondary inlet temps now back-computed; when secondary flow is near zero, loops cool toward ambient over time.
+- Meltdown threshold: 2873 K. Auto rod control clears shutdown when set to auto and adjusts rods. Control rod worth/tuning currently unchanged.
+- Tests: `pytest` passing after all changes. Key regression additions include generator manual mode, turbine no-steam output, auto rod control, and passive cool-down.