#118: the eject slot graphic lands -- BitMapInverseWipeScalar reconstructed

The operator's field report ("eject slot flashing but no graphic in it") was
the tracked-NULL bring-up stub in BallisticWeaponCluster. Reconstructed the
missing gauge class from the binary:

- BitMapInverseWipeScalar @004c61c8 (vtable 0x518a14; base @004c5e84,
  Execute @004c5fb8, BecameActive @004c5fa4): a bitmap COLUMN SWEEP whose
  level tracks a live Scalar -- two spans with INVERTED colour pairs,
  [0..level] fg colorA / bg colorB, remainder the inverse.
- Wired per the binary call site (part_014.c:2312): bteejtm.pcc at (0xF,0)
  on the weapon's eng port, colours 0/0xFF, watching the weapon's
  PercentOfEject (@0x3F8, the round-eject 0..1 progress) via a new
  complete-type bridge BTWeaponPercentOfEjectPtr (databinding rule).

At idle (level 0) the EJECT graphic now renders in the slot; during a
round-eject cycle it sweeps with the countdown. BTEEJTM.PCC ships in
content/GAUGE (the loose gauge bitmap set). Smoke-tested: constructs clean.

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

game/reconstructed/btl4gau2.cpp

@@ -2020,11 +2020,22 @@ BallisticWeaponCluster::BallisticWeaponCluster(
 	destroyedLamp = new TwoState(ChildRate(), eng_mode, renderer_in, owner_ID,
 		engPort, 0xc2, 0x85, "edestryd.pcc", 0, 0xff, (int *)&failedState, "TwoState");	// the destroyed X: bright when FAILED
 
-	// ejectWipe (BitMapInverseWipeScalar @004c61c8, eject-timer wipe reading
-	// subsys+0x3f8).  BRING-UP: the BitMapInverseWipeScalar class is not yet
-	// declared/reconstructed in btl4gaug (only the non-Scalar BitMapInverseWipe);
-	// tracked NULL until it lands.
-	ejectWipe = NULL;									// @0x44
+	// ejectWipe (BitMapInverseWipeScalar @004c61c8): the round-EJECT progress
+	// sweep -- bteejtm.pcc revealed column-by-column as the weapon's
+	// PercentOfEject (@0x3F8) runs 0..1.  Binary call (part_014.c:2312):
+	// FUN_004c61c8(., rate, eng_mode, renderer, ownerID, engPort, 0xF, 0,
+	// "bteejtm.pcc", 0, 0xFF, weapon+0x3f8, name).  Reconstructed 2026-08-03
+	// (#118 field report: the eject slot flashed EMPTY -- this was the
+	// tracked-NULL stub).
+	{
+		extern Scalar *BTWeaponPercentOfEjectPtr(void *weapon);
+		Scalar *ejectPct = BTWeaponPercentOfEjectPtr(subsystem_in);
+		ejectWipe = (ejectPct != NULL)
+			? new BitMapInverseWipeScalar(ChildRate(), eng_mode, renderer_in,
+				owner_ID, engPort, 0xF, 0, "bteejtm.pcc", 0, 0xFF,
+				ejectPct, "BitMapInverseWipeScalar")
+			: NULL;										// @0x44
+	}
 }
 
 BallisticWeaponCluster::~BallisticWeaponCluster()