gauge wave P3: wire the combat scoring feed (KILLS tracks combat)

The Comm roster + score gauges read 0 for 4 independent reasons (none was handler
logic -- the BTPlayer ScoreMessage/VehicleDead/ScoreInflicted handlers were already
reconstructed).  Mapped by the scoring-feed-decode workflow; fixed all 4:

- NO PRODUCER: combat only dispatched Entity::TakeDamageMessage, never a scoring
  message.  Added producers (btplayer.cpp bridges, called from mech4.cpp): per-hit
  ScoreInflicted at the beam (:2171) + projectile (:831) damage dispatch -> SCORE;
  KillScore at the TARGET-DESTROYED edge (:2198) -> KILLS.  senderMechID = the
  VICTIM (so the local player is credited via the !=our-mech branch, not the
  suicide-negate branch); dispatched to application->GetMissionPlayer().
- CROSS-FAMILY MECH OFFSETS: MECH_OWNING_PLAYER/TONNAGE/DAMAGE_BIAS read raw binary
  offsets (garbage in our 0x638 Mech).  MECH_OWNING_PLAYER -> Entity::GetPlayerLink()
  (NULL for the ownerless dummy); tonnage/bias stubbed 1.0/0.0 (bring-up).
- NULL scenarioRole: the BTMission role registry has no WinTesla analog, so every
  award path NULL-deref'd.  CalcInflictedScore returns the neutral (damage+bias)
  when scenarioRole==0; DamageReceived guarded.
- NULL-owner dummy: the KillScore sender-owner increment + StatusMessage now guard
  GetPlayerLink() (the dummy has none) so a solo kill credits only the local player.
- DATABINDING: the PilotList read KILLS/DEATHS at raw offsets (pilot+0x27c/+0x200)
  that don't match our compiled layout -> silent 0.  Repointed to the compiled
  members via bridges (BTPilotKills/BTPilotDeaths -> BTPlayer::GetKillCount/GetDeaths).
  ⚠ ROOT-CAUSE of the empty scoreboard: the PilotList SELECT-TARGET highlight did a
  raw-offset deref (*(local+0x284) objectiveMech, then *(tgt+0x190)) that AV'd on our
  layout -- caught silently by the SEH GuardedExecute, aborting Execute BEFORE the
  KILLS/DEATHS draw.  Replaced with BTPilotIsSelected (accessors + GetPlayerLink).
- SCORE persistence: PlayerSimulation's 10s flush zeroed currentScore (the binary's
  console delta); now only flushes/zeros when a console host exists (solo keeps the
  running score for the gauge + CalcRanking).

Verified DBASE+dev gauges (BT_SCORE_LOG): SCORE climbs +5.83/hit -> 164; on the
kill KILLS 0->1, and the Comm roster RENDERS KILLS=1 (screenshot).  No crash.
Follow-ups (noted): DEATHS=1 is a pre-existing spawn/respawn-handshake artifact
(not from the producers -- the dummy's GetPlayerLink is NULL so no VehicleDead is
posted; confirmed killCount=1 not 2); RANK=-1 is CalcRanking's non-scoring mark
(Plasma serial surface, invisible on dev); MP VehicleDead/tonnage/role registry
remain per the plan.  Diagnostics kept: BT_SCORE_LOG.

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

game/reconstructed/btl4gau3.cpp

@@ -187,6 +187,11 @@ Logical
 // the bridge (mechmppr.cpp, a complete-Mech TU) resolves it -- this TU only sees
 // the pilot as an opaque pointer read at BTPlayer raw offsets.
 extern void *BTResolveRosterPilot(int slot);
+// gauge scoring wave: read a roster pilot's scoreboard via its compiled BTPlayer
+// members (btplayer.cpp), not raw offsets (which don't match our layout).
+extern int   BTPilotKills(void *pilot);
+extern int   BTPilotDeaths(void *pilot);
+extern int   BTPilotIsSelected(void *pilot, void *local_player);	// SELECT-TARGET highlight (safe)
 
 // App+0xC8 player-name-bitmap cache is not wired in the port (same deferral
 // PlayerStatus uses for its nameImage) -> NULL routes DrawMechIcon to the binary's
@@ -344,6 +349,11 @@ void
 	PilotList::Execute()
 {
 	void *local = BTResolveRosterPilot(0);				// slot-0 (local) pilot gates the body
+	{
+		static int s_pl = 0;
+		if (getenv("BT_SCORE_LOG") && (s_pl++ % 120) == 0)
+			DEBUG_STREAM << "[score] PilotList::Execute local=" << local << "\n" << std::flush;
+	}
 	if (local == NULL)
 		return;
 
@@ -375,8 +385,11 @@ void
 	}
 	else
 	{
-		void *tgt = *(void **)((char *)local + 0x284);	// local pilot's target (objectiveMech)
-		int selected = (tgt != NULL) && (pilot == *(void **)((char *)tgt + 0x190));	// target's owningPlayer
+		// SELECT-TARGET highlight -- via the safe bridge (accessors), NOT raw offsets:
+		// the old `*(local+0x284)` objectiveMech + deref `*(tgt+0x190)` read garbage in
+		// our compiled layout and AV'd inside the SEH-guarded Execute, silently aborting
+		// it before the KILLS/DEATHS draw below (= the empty scoreboard).
+		int selected = BTPilotIsSelected(pilot, local);
 		if ((int)(size_t)pilot != e.resolvedMech || e.selected != selected)
 		{
 			localView.MoveToAbsolute(e.x, e.y);			// vtbl+0x24
@@ -385,13 +398,16 @@ void
 			// (byte-faithful: the binary does NOT latch e.resolvedMech here, so the
 			//  icon redraws each occupied frame.)
 		}
-		// KILLS = killCount@0x27c (real; ScoreMessageHandler kill branch increments it).
-		e.nameDisplay->Draw(&localView, (Scalar)(*(int *)((char *)pilot + 0x27c)));
-		// DEATHS: the binary reads pad_0x280 (NO writer anywhere -> perpetual 0 = a
-		// shipped dead field).  FIX (correctness deviation, per "if it doesn't work,
-		// fix it"): read the real deaths counter Player::deathCount@0x200
-		// (VehicleDeadMessageHandler increments it), so DEATHS is meaningful in MP.
-		e.mechDisplay->Draw(&localView, (Scalar)(*(int *)((char *)pilot + 0x200)));
+		// KILLS / DEATHS -- gauge scoring wave (Step 1, the databinding fix): read the
+		// pilot's COMPILED named members via the BTPlayer bridge, NOT raw binary offsets.
+		// The earlier pilot+0x27c / +0x200 reads assumed the 1995 layout; our compiled
+		// BTPlayer/Player layout differs (engine base != binary), so those offsets read a
+		// stale/garbage slot -> a silent 0 even after the handlers increment the members.
+		// The bridge reads the SAME members the ScoreMessageHandler/VehicleDead handlers
+		// write (killCount / Player::deathCount).  (DEATHS uses the real deathCount, not
+		// the binary's dead pad_0x280.)
+		e.nameDisplay->Draw(&localView, (Scalar)BTPilotKills(pilot));	// KILLS  (killCount)
+		e.mechDisplay->Draw(&localView, (Scalar)BTPilotDeaths(pilot));	// DEATHS (Player::deathCount)
 	}
 
 	++currentSlot;