BT410 Phase 5.3.18: flying missiles -- spawn/home/detonate LIVE, teardown open

The Missile entity family is reconstructed: Projectile : Mover gets a real
make-path ctor; Missile hosts the Seeker + MissleThruster roster (the
AUTHENTIC surviving SEEKER.HPP / MISTHRST.HPP interfaces -- the 1995
misspelling included) and flies the binary's guided integrator (@004bef78):
age/lifetime, seeker re-lead with the decoded loft constants
(200/50/300/0.1), thruster burn, steering (gain 4.0, deadband 1e-4), and
the proximity fuse delivering the cluster damage ONCE with the launcher as
inflictor.  Live-verified end-to-end: LAUNCH -> flight telemetry (thruster
visibly accelerating) -> DETONATE on the target ~0.9s out.

OPEN: the first ~Missile off the death row completes, then the frame
page-faults with EIP in the heap -- the first entity/subsystem teardown the
reconstructed sim has ever run.  The spawn path is therefore OPT-IN
(BT_MISSILE_FLIGHT=1); default SRM delivery stays the 5.3.18a instant-hit
cluster (verified 1:1, zero exceptions).  Forensics + engine truths
(SearchList crashes on non-directory ids; MakeMessages need FAMILY resource
ids; explosionModelFile is a model-list INDEX) in MISSILE.NOTES.md.

Also fixed on the way: the Subsystem NAME ctor left damageZone
UNINITIALIZED (latent garbage for every name-built subsystem).

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

restoration/source410/BT/PROJTILE.CPP

@@ -1,10 +1,20 @@
 //===========================================================================//
-// Project: BattleTech                                                       //
+// File:	projtile.cpp                                                        //
+// Project: BattleTech           Brick: Mech weapons                          //
+// Contents: Projectile -- the flying-round entity base (Missile derives)    //
 //---------------------------------------------------------------------------//
 // Copyright (C) 1995, Virtual World Entertainment, Inc.                     //
 // All Rights reserved worldwide                                             //
 // This unpublished sourcecode is PROPRIETARY and CONFIDENTIAL               //
 //===========================================================================//
+//
+// PARTIAL (binary ctor @004be1bc, vtable @00512a5c, 0x340 bytes): the base
+// chains the Mover make path -- the MakeMessage's resourceID is the
+// projectile GameModel, so the Mover ctor streams the authored mass / drag /
+// inertia.  The tracer/ballistic body (the unguided MoveAndCollide, smoke
+// trail, PROJTILE.TCP surface) joins the autocannon wave; the Missile
+// subclass carries the only flying rounds in the 4.10 pod content.
+//
 
 #include <bt.hpp>
 #pragma hdrstop
@@ -29,8 +39,27 @@ Projectile::SharedData
 	);
 
 Projectile*
-	Projectile::Make(MakeMessage *)
+	Projectile::Make(MakeMessage *creation_message)
 {
-	Fail("Projectile::Make -- projtile.cpp not yet reconstructed");
-	return NULL;
+	return new Projectile(creation_message);
+}
+
+Projectile::Projectile(
+	MakeMessage	*creation_message,
+	SharedData	&shared_data
+):
+	Mover(creation_message, shared_data)
+{
+	Check(creation_message);
+	Check_Fpu();
+}
+
+Projectile::~Projectile()
+{
+}
+
+Logical
+	Projectile::TestInstance() const
+{
+	return IsDerivedFrom(ClassDerivations);
 }