Mark condenser realism complete in TODO

TODO.md

@@ -5,7 +5,7 @@
 - [x] Pressurizer behavior, primary/secondary inventory and level effects, and pump NPSH/cavitation checks.
 - [x] Model feedwater/steam-drum mass-energy balance, turbine throttle/efficiency maps, and condenser back-pressure.
 - [ ] Introduce CHF/DNB margin, clad/fuel split temps, and SCRAM matrix for subcooling loss or SG level/pressure trips.
-- [ ] Flesh out condenser behavior: vacuum pump limits, cooling water temperature coupling, and dynamic back-pressure with fouling.
+- [x] Flesh out condenser behavior: vacuum pump limits, cooling water temperature coupling, and dynamic back-pressure with fouling.
 - [ ] Dashboard polish: compact turbine/generator rows, color critical warnings (SCRAM/heat-sink), and reduce repeated log noise.
 - [ ] Dashboard multi-page view (F1/F2): retain numeric view on F1; future F2 schematic should mirror real PWR layout with ASCII art, flow/relief status, and minimal animations; add help/status hints and size checks; keep perf sane.
 - [ ] Incremental realism plan:
@@ -15,4 +15,3 @@
   - [x] Add integration test: cold start → gens/pumps 2/2 → ramp to ~3 GW → confirm steam quality threshold at the secondary drum → enable all turbines and require electrical output. Include a step that tolerates one secondary pump off for a period to prove redundancy still yields steam.
 - [x] Dashboard follow-ups: replace turbine “Steam P” with a more useful steam availability signal (enthalpy × steam flow).
 - [x] Relief modeling: vent both loops gradually to ~1 MPa when reliefs are open, removing steam enthalpy/mass and capping pump targets to prevent instant repressurization.
-- [x] Dashboard follow-ups: replace turbine “Steam P” with a more useful steam availability signal (enthalpy × steam flow).