Combat visible + killable: Wword root-cause fix, .PFX effect layer, RemakeEntity swap

The 'can't kill the enemy / no visible damage' cluster, root-caused and fixed
faithfully:

- STEP-6 unaimed path was INERT: the cylinder table was 'cached' at Wword(0x111)
  -- the recon ABSORBER bank (stores nothing, reads 0) -- so every unaimed hit
  silently no-op'd.  Promoted to the named member Mech::damageLookupTable
  (binary this[0x111], was mislabeled ammoExpended).  New gotcha class recorded
  (reconstruction-gotchas §2) + sweep; 2 dead multiplayer branches logged.

- Fire path migrated off the stale vital-zone aim onto the completed STEP-6
  unaimed dispatch (zone=-1 + beam entry point -> cylinder resolves the
  exterior zone).  No more invisible 1-shot kills; death via the authentic
  cascade (~14 center-mass hits).  Wreck stays TARGETED on kill (beams stop on
  it); scoring latches off.

- SendSubsystemDamage AV fixed: unbound critical-subsystem plug guard (43
  unbound plugs/mech logged as an open question -- the binding itself is a gap).

- RemakeEntity (render damage swap): the 1996 render state machine's missing
  Remake state, reconstructed as an in-place SetDrawObj mesh swap keyed by each
  segment's damage-zone graphic state (tree dtor doesn't cascade -> never
  rebuild).  Destroyed arms/guns visibly wreck (the only variants the RES
  registers).

- BT .PFX particle layer (L4VIDEO.cpp): the 1995 explosion/damage effect layer,
  unported since 2007 (DPLIndependantEffect/ReadPSFX/ExplosionScripts all
  stubs).  Parses the authentic VIDEO/*.PFX definitions via the [pfx_day]
  psfxN mapping; premultiplied blending renders BOTH families from the same
  data (additive-style fire + occluding smoke -- DDAM2 is 30% grey, DDTHSMK
  ramps negative: impossible additively); depth-sorted billboards with a
  radial-masked grit sprite; impact-frame orientation (.PFX offsets are
  authored mech-local, -Z = out of the struck armor toward the shooter) for
  weapon hits AND damage bands (via lastInflictingID, now maintained -- was
  declared but never written).  Both effect-number encodings route (raw dpl
  <100 + WinTesla 1000+slot carried by the band resources).  Death fires the
  authentic dnboom (7) + ddthsmk smoke plume (1).

- Effects anchor at the impact point / damaged zone's segment, not the mech
  origin (no more fire at the feet).

- Dev force-input gates BT_AUTOFIRE / BT_AUTODRIVE for headless fire-chain
  verification; BT_PFX_ADD=1 flips the particle blend for A/B.

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

game/reconstructed/mech.cpp

@@ -486,7 +486,13 @@ void
 	Mech::TakeDamageMessageHandler(TakeDamageMessage *message)
 {
 	Check(message);
-	DamageLookupTable *table = (DamageLookupTable *)Wword(0x111);
+	// Maintain the last-attacker bookkeeping (mech[0x43c]): read by the
+	// DamageZone LOD router (same-attacker redirect reuse, mechdmg.cpp:374)
+	// and by the damage-band effect orientation.  Was declared but never
+	// WRITTEN -- a reconstruction gap; the natural authentic write site is
+	// this handler (every damage message carries the inflictor).  [T3]
+	lastInflictingID = message->inflictingEntity;
+	DamageLookupTable *table = (DamageLookupTable *)damageLookupTable;	// named member (Wword absorbs!)
 	if (message->invalidDamageZone && table != 0)
 	{
 		int zone = table->ResolveHit(message->damageData.impactPoint);
@@ -1323,7 +1329,7 @@ Mech::Mech(
 	// cached at mech[0x111] (byte 0x444).  (Was an empty-name StandingAnimation
 	// stub -> 0 rows; the real class is dmgtable.cpp.)
 	//
-	Wword(0x111) = 0;
+	damageLookupTable = 0;								// named member (Wword absorbs!)
 	ResourceDescription *dzForName =
 		MechFindResource(creation_message->resourceID,
 			ResourceDescription::DamageZoneStreamResourceType);		// type 0x14 (for its name)
@@ -1339,7 +1345,7 @@ Mech::Mech(
 			DynamicMemoryStream cylStream(							// FUN_004032dc, offset 0
 				cylRes->resourceAddress, cylRes->resourceSize, 0);
 			DamageLookupTable *table = new DamageLookupTable(this, &cylStream);	// FUN_0049ea48
-			Wword(0x111) = (int)table;
+			damageLookupTable = (int)table;				// named member (Wword absorbs!)
 			DEBUG_STREAM << "[cyl] table '" << dzForName->resourceName
 				<< "' layers=" << table->LayerCount() << "\n" << std::flush;
 		}
@@ -1407,9 +1413,9 @@ Mech::~Mech()
 			<< "\n" << std::flush;
 	}
 
-	if (Wword(0x111) != 0)								// cylinder hit-location table (STEP 6)
+	if (damageLookupTable != 0)							// cylinder hit-location table (STEP 6)
 	{
-		delete (DamageLookupTable *)Wword(0x111);		// frees layers/slices/entries
+		delete (DamageLookupTable *)damageLookupTable;	// frees layers/slices/entries
 	}
 
 	//