Audio: footstep-chain diagnostics -- every link verified except the final trigger fire (task #50)

Instrumentation (all BT_AUDIO_LOG/BT_AUDIO_SPATIAL-gated): mech watcher-poll
probe (delayed flag + socket count via new Simulation::DebugAudioWatcherCount),
per-sim audio-socket size in ExecuteWatchers, trigger notifications (val>0),
watcher poll-rate/change probes, footstep pulse address trace.

VERIFIED working: FootStep binds to the real member (pulse addr == bound ptr,
same run); pulses fire per stride (40/run); the watcher registers on the mech
(audioWatchers=20 after audio-object creation); the mech's poll runs
(delayed=0, simFlags=0x1110); Logical == int (STYLE.H:132) matches the member
type.  The idle<->moving engine crossfade (AudioMotionScale on LocalVelocity
through the restored watcher poll) is CONFIRMED audible in play.

REMAINING: the FootFall transient still doesn't reach SetupPatch -- next probe
is the trigger's streamed threshold/inverse config and the speed-scaled
transient volume at the renderer drop gate (LowAudioVolumeThreshold=0.3).

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

engine/MUNGA/AUDWTHR.h

@@ -358,7 +358,7 @@ template <class T> void
 	Check_Pointer(attribute_ptr);
 	Scalar current_value = ExtractInterestingValue(attribute_ptr);
 
-	if (getenv("BT_AUDIO_SPATIAL")) { static int s_tg=0; if (s_tg++<80)
+	if (getenv("BT_AUDIO_SPATIAL") && current_value > 0.0f) { static int s_tg=0; if (s_tg++<120)
 		DEBUG_STREAM << "[trigger] attrPtr=" << (void*)attributePointer
 			<< " val=" << current_value << " thresh=" << attributeValueThreshold
 			<< " armed=" << (int)!triggerOn << "\n" << std::flush; }

engine/MUNGA/SIMULATE.cpp

@@ -1,3 +1,4 @@
+#include <cstdlib>
 #include "munga.h"
 #pragma hdrstop
 
@@ -486,6 +487,14 @@ void
 //#############################################################################
 // Watcher Support
 //
+int
+	Simulation::DebugAudioWatcherCount()
+{
+	SChainIteratorOf<Component*> iterator(audioWatcherSocket);
+	return (int)iterator.GetSize();
+}
+
+
 void
 	Simulation::ExecuteWatchers()
 {
@@ -496,6 +505,8 @@ void
 	// Audio
 	{
 		SChainIteratorOf<Component*> iterator(audioWatcherSocket);
+		if (getenv("BT_AUDIO_SPATIAL")) { static int s_ec=0; if ((s_ec++ % 600)==0)
+			DEBUG_STREAM << "[watchpoll] sim=" << (void*)this << " audioSocket size=" << iterator.GetSize() << "\n" << std::flush; }
 		while ((watcher = iterator.ReadAndNext()) != NULL)
 		{
 			watcher->Execute();

engine/MUNGA/SIMULATE.h

@@ -247,6 +247,9 @@ public:
 	void
 		ExecuteWatchers();
 
+	int		// DEBUG (BT_AUDIO_LOG): how many audio watchers are registered on this sim
+		DebugAudioWatcherCount();
+
 private:
 	SChainOf<Component*>
 		audioWatcherSocket;

game/reconstructed/mech4.cpp

@@ -5205,6 +5205,10 @@ void
 	// (AudioLogicalTrigger FootStep, AudioMotionScale/Trigger LocalVelocity, ...)
 	// never executed -- only the PUSHED StateIndicator watchers fired.  That's
 	// why footsteps/motion-scaled sounds were silent while state sounds worked.  [T0]
+	if (getenv("BT_AUDIO_LOG")) { static int s_wd=0; if ((s_wd++ % 300)==0)
+		DEBUG_STREAM << "[audio] mech watcher poll: delayed=" << (int)AreWatchersDelayed() << " audioWatchers=" << DebugAudioWatcherCount()
+			<< " simFlags=0x" << std::hex << (unsigned)simulationFlags << std::dec
+			<< "\n" << std::flush; }
 	if (!AreWatchersDelayed())
 		ExecuteWatchers();