4.10 reconstruction: BTL4OPT.EXE links clean and BOOTS to the first staged brick

The reconstructed tree now produces a runnable binary with the authentic
1995 toolchain (BC4.52 / tlink32 / DPMI32):

- BTL4.CPP main TU reconstructed from the 4.11 Ghidra decomp (FUN_0040109c)
  + the 4.10 binary's own string pool + surviving RPL4TOOL.CPP house style;
  probe_main.cpp scaffold retired (BTL4.NOTES.md documents every decoded call)
- L4NET.CPP staged: L4NetworkManager ctor/dtor + 10 vtable-pulled virtuals
  (standalone-benign ones no-op, network ones Fail loudly) + NetNub client
  globals (Net_Common_Ptr=NULL routes L4File to its plain-DOS path)
- build410.sh: libs now built in the AUTHENTIC makefile member order
  (MUNGA.MAK / mungal4.mak / BT.MAK / BTL4.MAK). Order is load-bearing:
  tlink emits static-init records in module pull order, and alphabetical
  order booted into a null-vptr crash (IcomManager::ClassDerivations
  constructing before parent NetworkClient::ClassDerivations). Also fixed
  stage_link to the proven 32-bit lib set (SOSDBXC+SOSMBXC, no WATTCPLG)
- BOXTREE.HPP MemoryBlock unify, BTL4GRND notify stubs, remaining engine
  backfills (audio/gauge/resource/stream TUs) that closed the deep ledger

Smoke test (DOSBox-X + 32RTM, copy of the pod BT tree, our exe swapped in):
  BattleTech v4.10
  BTL4Application::BTL4Application
  l4net.cpp(22): L4NetworkManager -- l4net.cpp not yet reconstructed
Static init, main, -egg parse, BTL4.RES load (version 1.0.6 check passes),
ApplicationManager and the BTL4Application ctor chain all execute real
reconstructed code; boot halts at the first staged Fail() as designed.
Next brick: the real l4net.cpp body.

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

restoration/source410/BT/BTDIRECT.CPP

@@ -27,3 +27,23 @@ BTCameraDirector::SharedData
 		1,
 		(Entity::MakeHandler)BTCameraDirector::Make
 	);
+
+BTCameraDirector::BTCameraDirector(
+	MakeMessage	*creation_message,
+	SharedData	&shared_data
+):
+	CameraDirector(creation_message, shared_data)
+{
+	Fail("BTCameraDirector -- btdirect.cpp not yet reconstructed");
+}
+
+BTCameraDirector::~BTCameraDirector()
+{
+}
+
+BTCameraDirector*
+	BTCameraDirector::Make(CameraDirector::MakeMessage *)
+{
+	Fail("BTCameraDirector::Make -- btdirect.cpp not yet reconstructed");
+	return NULL;
+}

restoration/source410/BT/BTPLAYER.CPP

@@ -27,3 +27,23 @@ BTPlayer::SharedData
 		1,
 		(Entity::MakeHandler)BTPlayer::Make
 	);
+
+BTPlayer::BTPlayer(
+	MakeMessage	*creation_message,
+	SharedData	&shared_data
+):
+	Player(creation_message, shared_data)
+{
+	Fail("BTPlayer -- btplayer.cpp not yet reconstructed");
+}
+
+BTPlayer::~BTPlayer()
+{
+}
+
+BTPlayer*
+	BTPlayer::Make(MakeMessage *)
+{
+	Fail("BTPlayer::Make -- btplayer.cpp not yet reconstructed");
+	return NULL;
+}

restoration/source410/BT/MECH.CPP

@@ -37,3 +37,20 @@ Mech::SharedData
 		33,
 		(Entity::MakeHandler)Mech::Make
 	);
+
+//
+//#############################################################################
+//#############################################################################
+//
+Mech*
+	Mech::Make(MakeMessage *)
+{
+	Fail("Mech::Make -- mech.cpp not yet reconstructed");
+	return NULL;
+}
+
+void
+	Mech::SetMappingSubsystem(Subsystem *)
+{
+	Fail("Mech::SetMappingSubsystem -- mech.cpp not yet reconstructed");
+}

restoration/source410/BT/MECHMPPR.CPP

@@ -0,0 +1,58 @@
+//===========================================================================//
+// File:	mechmppr.cpp                                                        //
+// Project: BattleTech                                                       //
+// Contents: Implementation details for the mech controls mapper             //
+//---------------------------------------------------------------------------//
+// Copyright (C) 1995, Virtual World Entertainment, Inc.                     //
+// All Rights reserved worldwide                                             //
+// This unpublished sourcecode is PROPRIETARY and CONFIDENTIAL               //
+//===========================================================================//
+
+#include <bt.hpp>
+#pragma hdrstop
+
+#if !defined(MECHMPPR_HPP)
+#	include <mechmppr.hpp>
+#endif
+
+Derivation
+	MechControlsMapper::ClassDerivations(
+		Subsystem::ClassDerivations,
+		"MechControlsMapper"
+	);
+
+MechControlsMapper::SharedData
+	MechControlsMapper::DefaultData(
+		MechControlsMapper::ClassDerivations,
+		Subsystem::MessageHandlers,
+		Subsystem::AttributeIndex,
+		1
+	);
+
+MechControlsMapper::MechControlsMapper(
+	Mech						*owner,
+	int							subsystem_ID,
+	CString						subsystem_name,
+	RegisteredClass::ClassID	class_ID,
+	SharedData					&shared_data
+):
+	Subsystem(
+		(Entity *)owner,
+		subsystem_ID,
+		subsystem_name,
+		class_ID,
+		shared_data
+	)
+{
+	Fail("MechControlsMapper -- mechmppr.cpp not yet reconstructed");
+}
+
+MechControlsMapper::~MechControlsMapper()
+{
+}
+
+Logical
+	MechControlsMapper::TestInstance() const
+{
+	return IsDerivedFrom(ClassDerivations);
+}

restoration/source410/BT/MISSILE.CPP

@@ -27,3 +27,10 @@ Missile::SharedData
 		1,
 		(Entity::MakeHandler)Missile::Make
 	);
+
+Missile*
+	Missile::Make(MakeMessage *)
+{
+	Fail("Missile::Make -- missile.cpp not yet reconstructed");
+	return NULL;
+}

restoration/source410/BT/PROJTILE.CPP

@@ -27,3 +27,10 @@ Projectile::SharedData
 		1,
 		(Entity::MakeHandler)Projectile::Make
 	);
+
+Projectile*
+	Projectile::Make(MakeMessage *)
+{
+	Fail("Projectile::Make -- projtile.cpp not yet reconstructed");
+	return NULL;
+}