gauge wave P1b: Searchlight/LightOn + fix coolant/refrigeration source misread

- Searchlight publishes "LightOn" -> lightState@0x1D8 (the button-5 searchlight
  lamp; the empty default-constructed index resolved NOTHING).  The config binds
  the name "LightOn", so the enum id is renamed LightOnAttributeID and the table
  is chained to PowerWatcher's dense index.  Verified: LightOn resolves OK.

- FIX a genuine reconstruction bug the heatmodel decode caught (heat.cpp
  UpdateCoolant + heatfamily_reslice RefrigerationSimulation): both read
  linkedSinks.Resolve()->heatEnergy where the binary reads *(this[0x38]+0x158) =
  the subsystem's OWN DamageZone.damageLevel (the engine base zone @0xE0).
  Consequences of the misread: coolantDraw = master.heatEnergy(~1.3e7) * heatLoad
  would SLAM the live CoolantMass bars to empty whenever the link resolved; and
  RefrigerationSimulation clamped massScale permanently to 1.0 (minimum) instead
  of the authentic 3.0, plus null-deref'd a Condenser whose linkedSinks is skipped.
  Now both read this->Subsystem::damageZone->damageLevel (qualified past the
  MechSubsystem shadow, per mechweap.cpp:252): undamaged 0 -> coolantDraw 0 (no
  leak, coolant bars stay full = authentic pristine) / massScale = 3.0, rising
  only as the sink/condenser itself takes battle damage.

After this only HeatSink/AmbientTemperature remains NULL (the #if 0'd aggregate
HeatSink bank -> P3).  Verified DBASE+dev gauges: no crash, combat un-regressed
(TARGET DESTROYED).  (Also noted: the Condenser dup-ctor links to the REAL
heatfamily_reslice definition -- LNK4006 keeps the first/real one; the heat.cpp
stub is ignored -- so no bug today; #if 0 cleanup deferred to the Condenser table.)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

game/reconstructed/searchlight.cpp

@@ -50,8 +50,21 @@ Derivation
 Receiver::MessageHandlerSet
 	Searchlight::MessageHandlers;		// includes { "ToggleLamp", &Searchlight::ToggleLamp } @00511210
 
+// gauge data-binding wave: publish "LightOn" -> lightState@0x1D8 (the button-5
+// searchlight lamp; the empty default-constructed index resolved NOTHING).
+// Chained to PowerWatcher's dense index.
+const Searchlight::IndexEntry
+	Searchlight::AttributePointers[]=				// @005111e0
+{
+	ATTRIBUTE_ENTRY(Searchlight, LightOn, lightState)	// @0x1D8 (reported on/off)
+};
+
 Searchlight::AttributeIndexSet
-	Searchlight::AttributeIndex;
+	Searchlight::AttributeIndex(
+		ELEMENTS(Searchlight::AttributePointers),
+		Searchlight::AttributePointers,
+		PowerWatcher::GetAttributeIndex()
+	);
 
 Searchlight::SharedData
 	Searchlight::DefaultData(			// @00511198