feat(omny): seed the 3 known CryoCon channels in SimOMNYTemperatures

Chan A "Cryo sample" 90K, Chan B "Cryo head" 82K, Chan C "Sample backup"
90K, all closed-loop (reading == setpoint). Channel D has no known real
use yet and is left unseeded.

csaxs_bec/devices/sim/sim_omny.py

@@ -334,12 +334,19 @@ _TEMP_CHANNELS = {
     47: ("Park_Cryo_L", "K", 140, 100.0, 73.2),
 }
 
+# CryoCon channels ("CRYO" bank, cryo_temperature1-4 -> A-D). Closed-loop controlled,
+# so the simulated reading is put at the real setpoint. Channel D has no known real
+# use yet -- left unseeded (shows as "0"/0.00; the CRYO branch of show_all() has no
+# name-based hiding, unlike the TEMP bank).
+# controller number (1=A, 2=B, 3=C, 4=D): (name, reading/setpoint in K)
+_CRYO_CHANNELS = {1: ("Cryo sample", 90.0), 2: ("Cryo head", 82.0), 3: ("Sample backup", 90.0)}
+
 
 class SimOMNYTemperatures(OMNYTemperatures):
     """OMNYTemperatures with all EPICS PVs replaced by in-memory mock PVs, seeded
     with realistic per-channel names/units/readings/setpoints for the 29 real "TEMP"
-    channels (see _TEMP_CHANNELS above). The 4 "CRYO" channels are not seeded yet --
-    pending the cryocon controller reference.
+    channels (see _TEMP_CHANNELS above) and the 3 known "CRYO" channels (see
+    _CRYO_CHANNELS above).
     """
 
     def __new__(cls, *args, **kwargs):
@@ -361,6 +368,18 @@ class SimOMNYTemperatures(OMNYTemperatures):
                 getattr(
                     temperatures.temperature_alarmstate, f"temperature_alarmstate{channel}"
                 ).put(0)
+            for controller_nr, (name, reading) in _CRYO_CHANNELS.items():
+                getattr(
+                    temperatures.cryo_temperature_name, f"cryo_temperature_name{controller_nr}"
+                ).put(name)
+                getattr(temperatures.cryo_temperature, f"cryo_temperature{controller_nr}").put(
+                    reading
+                )
+                getattr(
+                    temperatures.cryo_temperature_setpoint,
+                    f"cryo_temperature_setpoint{controller_nr}",
+                ).put(reading)
+            temperatures.cryo_temperature_closed_loop.put(1)
             temperatures.temperature_update_time.put(now)
             temperatures.cryo_temperature_update_time.put(now)
             return temperatures