gauge wave P2c: GeneratorCluster reconstructed + infra (gated -- parent aborts)

Reconstructed the 4th unbuilt widget (the 4 generator engineering panels, buttons
9-12) + its companions, but left it UNREGISTERED pending a runtime-abort fix:

- Generator OutputVoltage attribute table (powersub) -> outputVoltage@0x1DC, chained
  to HeatSink's dense index (temps already reach it).  Correct + reusable.
- ScalarBarGauge @004c72ac plain-Scalar variant (btl4gau2) -- the DIRECT-Scalar* bar
  the GeneratorCluster voltage bar needs (the existing @004c721c takes a resolved
  source object).  Correct + harmless.
- GeneratorCluster Make/ctor/dtor + 15-param methodDescription reconstructed from
  part_014.c:891-1013 (replacing the prose + placeholder Make + the bogus DAT pool);
  builds the 5 children (temp bar / voltage bar / leak wipe / 2 lamps).  Header fixed
  to the binary ctor param order (secondaryColor@0x94, +_reserved0xB0 -> sizeof 0xB4).
  ChildRate forward-declared.

⚠ REGISTRATION GATED (commented out in BTL4MethodDescription[]): registering it
aborts at runtime -- the 4 panels build (the 4 "BecameActive not defined" warnings
fire) then abort().  ISOLATED to the PARENT lifecycle: the abort PERSISTS with all 5
children nulled; there are no pure virtuals; Execute is SEH-guarded under BT_DEV_GAUGES
so the fault is in the unguarded ctor/lifecycle path.  The sibling SubsystemCluster
overrides BecameActive/Execute/TestInstance whereas the decode has GeneratorCluster
overriding ONLY the dtor -- that "inherits only the dtor" claim is the prime suspect.
Deferred; the 3 other P2 widgets (LeakGauge/VertNormalSlider/PilotList) ship clean.

Verified: unregistered -> parse-skips -> no abort; combat un-regressed (DESTROYED),
0 crashes.

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

game/reconstructed/powersub.hpp

@@ -352,6 +352,25 @@ class Generator;
 
 		void	ForceShortRecovery();					// @004b11bc (short-event recovery)
 
+	//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+	// Attribute Support  (gauge data-binding wave)
+	//
+	// The GeneratorCluster (engineering-screen buttons 9-12) binds Generator/
+	// OutputVoltage for its 0..12000 voltage bar.  The temps (CurrentTemperature/
+	// DegradationTemperature/FailureTemperature/CoolantMassLeakRate) already reach
+	// it via the inherited HeatSink table; OutputVoltage is a real Generator member
+	// (@0x1DC, NOT the Emitter alias).  Dense from HeatSink::NextAttributeID.
+	//
+	public:
+		enum {
+			OutputVoltageAttributeID = HeatSink::NextAttributeID,
+			NextAttributeID
+		};
+	private:
+		static const IndexEntry AttributePointers[];
+	public:
+		static AttributeIndexSet& GetAttributeIndex();
+
 	//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 	// Generator state machine (stateAlarm @0x1FC, level @0x210, 5 levels).
 	// Names best-effort from the embedded "GeneratorState" / message strings.