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/btplayer.cpp

@@ -1494,12 +1494,31 @@ void BTPostKillScore(Entity *victim, Scalar damage)			// Step 7: KILL (+ MP deat
 	{
 		return;
 	}
-	BTPlayer *local_player = (BTPlayer *)application->GetMissionPlayer();
-	if (local_player != 0)
+	// OBSERVED-KILL credit (MP KILLS fix, 2026-07-13; the symmetric twin of
+	// BTPlayerCountObservedDeath): every node maintains LOCAL score copies,
+	// so the kill must land on the KILLER's player-link object -- the same
+	// object the PilotList gauge reads (the roster resolves pilots via the
+	// mechs' GetPlayerLink()).  The old GetMissionPlayer() dispatch credited
+	// a copy the scoreboard never displays (kills stuck at 0 while deaths --
+	// which already flow through the player link -- counted; user-reported).
+	// Resolving the killer from the victim's lastInflictingID also credits
+	// the REMOTE player's local copy when THEY score ("target's kills
+	// display 0") -- each node witnesses the death transition and tallies
+	// its own copies self-consistently.
+	BTPlayer *killer_player = 0;
+	if (application->GetHostManager() != 0)
 	{
-		// KillScore (scoreType 2): senderMechID MUST be the VICTIM (!= our mech) so
-		// the local player is credited via `this->killCount++` -- if it were our own
-		// mech, ScoreMessageHandler takes the suicide branch (award negated, no kill).
+		Entity *killer = application->GetHostManager()->GetEntityPointer(
+			((Mech *)victim)->lastInflictingID);
+		extern int BTIsRegisteredMech(Entity *e);
+		if (killer != 0 && killer != victim && BTIsRegisteredMech(killer))
+			killer_player = (BTPlayer *)((Mech *)killer)->GetPlayerLink();
+	}
+	if (killer_player != 0)
+	{
+		// KillScore (scoreType 2): senderMechID MUST be the VICTIM (!= the
+		// receiver's mech) so the handler credits `killCount++` -- a suicide
+		// (killer == victim) never reaches here.
 		BTPlayer::ScoreMessage kill(
 			Player::ScoreMessageID,						// 0x12
 			sizeof(BTPlayer::ScoreMessage),
@@ -1507,13 +1526,12 @@ void BTPostKillScore(Entity *victim, Scalar damage)			// Step 7: KILL (+ MP deat
 			0.0f,										// scoreAward (killBonus; 0 for bring-up)
 			damage,										// damageAmount (killing-blow)
 			victim->GetEntityID());						// senderMechID = victim
-		local_player->Dispatch(&kill);
+		killer_player->Dispatch(&kill);
 		if (getenv("BT_SCORE_LOG"))
-			DEBUG_STREAM << "[score] *** KILL *** localPlayer=" << (void *)local_player
-				<< " killCount=" << local_player->GetKillCount()
-				<< " deaths=" << local_player->GetDeaths()
-				<< " score=" << (Scalar)local_player->GetScore()
-				<< " rank=" << local_player->GetRanking() << "\n" << std::flush;
+			DEBUG_STREAM << "[score] *** KILL *** killerPlayer=" << (void *)killer_player
+				<< " killCount=" << killer_player->GetKillCount()
+				<< " deaths=" << killer_player->GetDeaths()
+				<< " score=" << (Scalar)killer_player->GetScore() << std::endl;
 	}
 
 	// MP DEATH: credit a death to the VICTIM's own player.  NULL for the solo