Torso-elevation aim LIVE: R/F now pitches the view + aim ray (pitch was inert)

User + tester reports: pitch does not work.  Root cause: the Torso sim
integrated the R/F / stick-Y axis into currentElevation (authored limits
and rates all correct) but NOTHING consumed it -- eyepointRotation's only
writer was the look-state switch, so neither the cockpit view nor the aim
ray (camera basis) ever pitched.  Shots always flew level; low targets
(trucks) were unhittable.

Fix (faithful: the pod's stick-Y pitches the EYE; the torso geometry does
not tilt): per-frame compose in the HUD tick --
eyepointRotation = EulerAngles(lookPitch + torsoElevation, lookYaw, 0);
BTCommitLookState now stores its look component in gBTLookPitch/Yaw; new
complete-type bridge BTGetTorsoElevation (torso.cpp, mirrors
BTGetTorsoTwist).  DPLEyeRenderable consumes it every frame, so the view
and the boresight aim pitch together (crosshair stays screen-centred).

Sign PIXEL-CALIBRATED via new diag BT_FORCE_ELEV=<-1..1> (pins the axis
headless): screenshots confirm axis +1 (key R) = aim UP, -1 (F) = down.
X still recenters.  Awaiting human verification.

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

game/reconstructed/torso.cpp

@@ -1040,6 +1040,18 @@ Scalar BTGetTorsoTwist(Subsystem *torso)
 	return torso ? ((Torso *)torso)->CurrentTwist() : 0.0f;
 }
 
+//
+// Live torso ELEVATION (pitch aim, rad) -- Torso::currentElevation == the
+// binary torso+0x1E4.  Same complete-type-TU bridge pattern as
+// BTGetTorsoTwist above.  Consumed by the per-frame eyepoint compose
+// (mech4.cpp): the R/F / stick-Y aim pitches the EYE only -- the torso
+// geometry does not tilt, exactly like the pod.
+//
+Scalar BTGetTorsoElevation(Subsystem *torso)
+{
+	return torso ? ((Torso *)torso)->CurrentElevation() : 0.0f;
+}
+
 //
 // Task #56 bridge -- ADDRESS of the live torso twist for the gyro's external-
 // pitch pointer (binary bt_mech stream tail: gyro+0x258 = torso+0x1D8; the gyro