Cockpit view live: V toggle, camera gate, real EyepointRotation, inside skeleton

- V toggles the authentic cockpit eyepoint <-> the chase camera.  Both eyes
  coexist; DPLEyeRenderable::Execute now writes the VIEW only when it IS
  mCamera (unconditional writes let the last-executed eye stomp the toggle).
- EyepointRotation is a real zeroed EulerAngles member on Mech (was bound to
  the shared junk attrPad -- the eye composes this attribute into the view
  EVERY frame, so the cockpit camera was rotated by garbage: the canted
  horizon, then the black screen).  The eye-slew systems write it later.
- The cockpit eye mounts at the eyepoint's REST position with a clean upright
  forward basis on the tree root (the live joint chain fed it the site tilt +
  torso pose; authentic pitch/yaw is the deferred gyro eye chain).
- The inside view swaps the player to the INSIDE skeleton mesh set
  (SkeletonType_A): 19 body segments hide, exactly one mesh remains --
  blx_cop.bgf, the authentic cockpit canopy shell around the eyepoint.  It
  currently renders as a black enclosure (the black-screen report), so it is
  HIDDEN pending its interior/punch-material rendering (BT_INSIDE_COCKPIT=1
  shows it for that work).  Damage gstates respected in both directions;
  RemakeEntity keys off the DISPLAYED skeleton.
- Dev: BT_START_INSIDE=1 starts in the cockpit view.

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

game/reconstructed/mech.cpp

@@ -531,7 +531,7 @@ const Mech::IndexEntry
 	ATTRIBUTE_ENTRY(Mech, CollisionMaterialType,   attrPad),				// 0x19
 	ATTRIBUTE_ENTRY(Mech, CurrentSpeed,            legCycleSpeed),		// 0x1a (existing @0x348)
 	ATTRIBUTE_ENTRY(Mech, MaxRunSpeed,             reverseStrideLength),	// 0x1b (existing @0x34c = run/top speed)
-	ATTRIBUTE_ENTRY(Mech, EyepointRotation,        attrPad),				// 0x1c
+	ATTRIBUTE_ENTRY(Mech, EyepointRotation,        eyepointRotation),		// 0x1c (real member -- the eye reads it per frame)
 	ATTRIBUTE_ENTRY(Mech, TargetReticle,           attrPad),				// 0x1d
 	ATTRIBUTE_ENTRY(Mech, FootStep,                attrPad),				// 0x1e
 	ATTRIBUTE_ENTRY(Mech, AnimationState,          attrPad),				// 0x1f
@@ -1318,7 +1318,8 @@ Mech::Mech(
 		deathHandler = (int)new MechDeathHandler(this);			// FUN_0042a984
 		critRes->Unlock();
 	}
-	wreckSmokeTimer = 0.0f;
+	wreckSmokeTimer  = 0.0f;
+	eyepointRotation = EulerAngles(Radian(0.0f), Radian(0.0f), Radian(0.0f));
 
 	//
 	// Cylinder hit-location table (resource type 0x1d = DamageLookupTableStream) --