Audio: AmmoBin AmmoState + chain its attribute index -> ZERO state-watcher skips (task #50)

AmmoBin::AttributeIndex was a bare, default-constructed static with NO parent
chain, so nothing resolved on an AmmoBin -- even the inherited SimulationState
came back NULL (the audio AmmoState + SimulationState watchers were skipped).

- Chain AmmoBin::AttributeIndex to HeatWatcher::GetAttributeIndex() and give it a
  real AttributePointers[] with AmmoState -> ammoAlarm (@0x194, the 6-level 0x54
  StateIndicator-compatible feed alarm, already SetLevel'd Feeding/Loaded/Empty/
  Dumped by the sim) so reload/empty/feed audio fires on the ammo transition.

With this every StateIndicator audio attribute across the mech + all subsystems
binds to a real indicator: audiostate skips 85 -> 0.  Remaining audio gaps are the
inert Logical/Scalar/Enum subsystem attrs (ReportLeak/GeneratorOn/ConfigureActive
Press/MotionState/SpeedOfTorsoHorizontal/TargetRangeExponent), which read 0 (silent,
non-crashing) pending backing members in their size-locked layouts.

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

game/reconstructed/ammobin.cpp

@@ -94,7 +94,21 @@ Derivation
 	);
 
 Receiver::MessageHandlerSet		AmmoBin::MessageHandlers;
-Simulation::AttributeIndexSet	AmmoBin::AttributeIndex;
+
+// AmmoState -> ammoAlarm (@0x194).  Chained to HeatWatcher so the inherited
+// SimulationState (and any parent attrs) resolve -- the old bare AttributeIndex
+// had no parent, so nothing resolved on an AmmoBin.
+const AmmoBin::IndexEntry
+	AmmoBin::AttributePointers[]=
+{
+	ATTRIBUTE_ENTRY(AmmoBin, AmmoState, ammoAlarm)	// @0x194 (0x54 StateIndicator-compatible feed alarm)
+};
+
+Simulation::AttributeIndexSet	AmmoBin::AttributeIndex(
+	ELEMENTS(AmmoBin::AttributePointers),
+	AmmoBin::AttributePointers,
+	HeatWatcher::GetAttributeIndex()
+);
 
 AmmoBin::SharedData
 	AmmoBin::DefaultData(						// resolved as &DAT_005125bc

game/reconstructed/ammobin.hpp

@@ -113,6 +113,17 @@
 			StateCount
 		};
 
+		// Attribute Support -- audio binds an AudioStateWatcher to AmmoState; it
+		// resolves to ammoAlarm (@0x194, a 0x54 StateIndicator-compatible alarm) so
+		// the feed/reload/empty audio fires on the AmmoState transition.  The static
+		// AttributeIndex (ammobin.cpp) is now chained to HeatWatcher -- previously it
+		// was a bare, unchained index, so even SimulationState resolved to NULL.
+		enum {
+			AmmoStateAttributeID = HeatWatcher::NextAttributeID,
+			NextAttributeID
+		};
+		static const IndexEntry AttributePointers[];
+
 		typedef void
 			(AmmoBin::*Performance)(Scalar time_slice);