Authentic target acquisition LIVE: reticle slew + pick-ray lock + aimed zone damage (task #36)

The engine Reticle model (MUNGA/RETICLE.h [T0]) reconstructed end to end:
- Mech::targetReticle is a real Reticle member bound to the TargetReticle
  attribute (0x1d), per the RP VTV analog (VTV.h targetReticle).
- Crosshair slew: mouse -> client rect -> reticle coords (the pod stick
  free-aim channel's dev-box stand-in); BT_AIM="x y" pins it headless.
  LMB fires lasers / RMB missiles (alongside SPACE/CTRL).
- Pick ray: the ACTIVE eye publishes pos + LookAtRH basis (BTSetAimCamera,
  L4VIDRND view-write site) + the render loop publishes proj._22;
  BTGetAimRay builds the world ray, Mech::PickRayHit slab-tests it against
  the collision template's ExtentBox via the engine's BoundingBox::HitBy
  (local frame; clips the Line at entry) -> world hull point.
- Designation: the mech under the crosshair designates (sticky; re-hover
  refreshes; cleared when the target leaves the roster at burial); the
  entity target slots 0x37c/0x388/0x38c feed the whole weapon path.
- Aimed fire: while HOT the impact point is the PICKED hull point -> the
  STEP-6 cylinder lookup resolves the zone under the crosshair (verified:
  center-aim -> head-band zone 13 dominant). Off-crosshair the sticky
  designation converges on center mass.
- HUD: the aim group draws at the slewed position ([0x9a] translate,
  contained by push/pop); the designator ring tracks the target's
  projected point (subB9 hot / subB8 designated, BTProjectToReticle);
  edge arrows when off-screen/behind.
- AUTHENTIC gating: no fire arc exists in the binary (FireWeapon fires
  whenever HasActiveTarget, part_013.c:7758) -> BT_FIRE_ARC is now an
  explicit OPT-IN presentation clamp; the hardwired gEnemyMech lock and
  the projectile path's gEnemyMech fallback are removed.
- Fixed en route: every renderable rebuild stomped mCamera back to the
  chase eye (start-inside silently lost the cockpit camera; the aim feed
  exposed it). BTL4VideoRenderer::mViewInside persists the chosen view.

Verified headless: BT_AIM="0 0" -> HOT lock, pick hits the hull face at
exact range, aimed zones resolve; BT_AIM="0.8 0.3" -> no lock, zero
damage, zero missile launches; kill chain completes to wreck + smoke.

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

engine/MUNGA_L4/L4VIDRND.cpp

@@ -5575,7 +5575,33 @@ void
 			// BOTH the cockpit and chase eyes; an unconditional write here let
 			// whichever eye executed LAST stomp the toggled camera every frame.
 			if (myRenderer->mCamera == this)
+			{
 				myDevice->SetTransform(D3DTS_VIEW, &view);
+
+				if (dbgEyeExec < 8)
+					DEBUG_STREAM << "[EYE]   ACTIVE eye " << (void *)this
+						<< " (mCamera match) pos.y=" << pos.y << "\n" << std::flush;
+
+				// aim-ray feed (task #36): publish this eye's world pose --
+				// the LookAtRH basis (zaxis = back, view direction = -zaxis)
+				// -- for the reticle pick ray / designator projection.
+				{
+					extern void BTSetAimCamera(const float pos[3], const float xax[3],
+											   const float yax[3], const float zax[3]);
+					D3DXVECTOR3 zax = pos - at;
+					D3DXVec3Normalize(&zax, &zax);
+					D3DXVECTOR3 xax;
+					D3DXVec3Cross(&xax, &up, &zax);
+					D3DXVec3Normalize(&xax, &xax);
+					D3DXVECTOR3 yax;
+					D3DXVec3Cross(&yax, &zax, &xax);
+					const float p[3] = { pos.x, pos.y, pos.z };
+					const float x3[3] = { xax.x, xax.y, xax.z };
+					const float y3[3] = { yax.x, yax.y, yax.z };
+					const float z3[3] = { zax.x, zax.y, zax.z };
+					BTSetAimCamera(p, x3, y3, z3);
+				}
+			}
 		myRenderer->GetMatrixStack()->Pop();
 	}
 	else if (dbgEyeExec < 8)