Torso: the TWIST goes LIVE -- electrical watchdog chain, centered crosshair, coherent controls (task #57/#58)

The MadCat torso twists, the view turns with it, and targeting follows.
Three reconstruction fronts closed:

THE ELECTRICAL WATCHDOG CHAIN (why the torso never powered up):
- PowerWatcher::UpdateWatch reconstructed (@004b181c, the REAL registered
  Performance -- PTR @0050f5fc; Ghidra missed the fn start): the watchdog
  MIRRORS the watched subsystem's electrical level (+0x278), brownout
  downgrade when gen output <= minVoltage% x rated.  @004b1804 relabeled
  ResetToInitialState (slot 10) -- the old "Simulation" tag was wrong.
- The factory watcher-CONNECT pass reconstructed (vtable slot +0x38,
  @004aee2c/@004b1a40 byte-identical, recovered from raw exe bytes):
  watchedLink.Add(roster[watchedSubsystem]) on the master node.  Was the
  SubProxy::Start() no-op -- every watchdog sat at 0 forever.
- MinVoltageScale = 0.01 (a 10-byte x87 literal @0x4b1924; was 1.0f =
  permanent brownout) and PowerWatcher's Derivation chains its REAL base
  HeatWatcher (the HeatableSubsystem stand-in broke IsDerivedFrom for the
  whole Torso/Searchlight/ThermalSight family).
- KB correction swept: derivation tag 0x50e604 = HEATWATCHER (not
  "HeatSink"); the btl4gaug heat-widget gate now tests it via the
  BTIsHeatWatcher bridge.

THE CROSSHAIR (task #58 forensics, 6-agent workflow + live probes):
- The VIEW is TORSO-MOUNTED: jointtorso -> jointeye -> siteeyepoint in
  every twist-capable .SKL; the camera + canopy ride the same hinge
  subtree through HingeRenderable's live matrix-stack compose -- ALREADY
  WORKING in the port.  The crosshair stays screen-centered (center IS
  the boresight); the twist reads on the tape carets/compass/radar.
- The real bug was the port's gBTAimX = tan(twist) slew (the falsified
  "body-mounted view" model): the camera already carried the twist, so
  the crosshair counter-slid to hull-forward and the fire ray with it.
  Deleted; the pick ray inherits the twist from the yawing eye basis.
- Two instrumentation traps documented (chase-eye-as-default-camera,
  BT_FORCE_TORSO clobbering real joints -> the hook now only fills
  unresolved ones); an over-correcting explicit eye compose was added on
  those false readings and retired the same day.

CONTROLS + REPLICATION:
- Q/E spring-center on release (the axis is a twist-RATE demand; the old
  hold-deflection model drifted forever); X also zeroes the axis and
  pulses the authentic torso Recenter (@004b6918).  M cycles control
  mode via the real CycleControlMode body.
- Torso update-record DIRECTION fixed: engine truth is Write=serialize /
  Read=apply; @004b6a78 is the READ (was mislabeled Write) and the
  missing WRITE @004b6a1c recovered from raw disasm (recordLength 0x1C,
  twist/vel/rate at +0x10/14/18) -- kills the replicant's 0xCDCDCDCD
  -140-degree ghost twist.
- Marching-ghost desync: 4 Standing-case guards zero stale reverse
  cycleSpeed (negative cadence passed the <= ZeroSpeed stop gate).
- Kill credit rerouted to the OBSERVED killer (lastInflictingID ->
  killer's player link) -- kills count, target K/D populates.

KB: subsystems.md (watcher chain), multiplayer.md (record direction),
combat-damage.md + gauges-hud.md + cockpit-view.md (torso-mounted view
re-correction), decomp-reference.md (new addresses + tag fix),
open-questions.md (dead capability-roster loops 2-4, snapshot CD read).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

game/reconstructed/mech.cpp

@@ -1187,12 +1187,40 @@ Mech::Mech(
 	//
 	// Build the capability sub-rosters by IsDerivedFrom() class tests.
 	//
-	for (int id = 2; id < subsystemCount; ++id)			// "start" each subsystem
+	// Loop 1 = the watcher CONNECT pass (task #57).  The binary calls vtable
+	// slot +0x38 on every HeatWatcher-derived subsystem (@0x50e604 test);
+	// the slot bodies (FUN_004aee2c, PowerWatcher/Torso override @004b1a40,
+	// byte-identical -- Ghidra missed both starts, recovered from raw bytes)
+	// bind watchedLink to roster[watchedSubsystem], gated on the owner being
+	// the live master node ((flags & 0xC)==0 && (flags & 0x100)).  The gate is
+	// hoisted out of the loop unchanged (constant per mech).  This replaces
+	// the old SubProxy::Start() no-op that left every watchdogAlarm at 0 --
+	// which held the Torso's ElectricalStateLevel() below Ready and zeroed the
+	// twist rate forever.
+	//
+	if ((simulationFlags & 0xC) == 0					// SegmentCopyMask
+		&& (simulationFlags & 0x100) != 0)				// MasterHeatSinkFlag
 	{
-		SubProxy *s = (SubProxy *)subsystemArray[id];
-		if (s != 0 && s->IsDerivedFrom(0x50e604))		// FUN_0041a1a4
+		extern int  BTWatcherWatchedIndex(Subsystem *sub);				// heatfamily_reslice.cpp
+		extern void BTWatcherBindTarget(Subsystem *sub, Subsystem *target);
+		for (int id = 2; id < subsystemCount; ++id)
 		{
-			s->Start();									// (**(s+0x38))(s)
+			int watched = BTWatcherWatchedIndex(subsystemArray[id]);	// -1 = not a HeatWatcher
+			if (watched < 0)
+				continue;
+			if (watched < subsystemCount && subsystemArray[watched] != 0)
+			{
+				BTWatcherBindTarget(subsystemArray[id], subsystemArray[watched]);
+				DEBUG_STREAM << "[watch] subsystem " << id << " watches "
+					<< watched << std::endl;
+			}
+			else
+			{
+				// The binary has no range check (CreateStreamed validated the
+				// name); flag data drift honestly instead of a wild read.
+				DEBUG_STREAM << "[watch] subsystem " << id
+					<< " BAD WatchedSubsystem index " << watched << std::endl;
+			}
 		}
 	}
 	for (int id = 2; id < subsystemCount; ++id)			// heatable roster