Searchlight reconstruction -- the pod's night kit, both halves

The subsystem (sim/toggle/attribute/replication) was already complete; this
lands the missing VISUALS, decoded from MakeMechRenderables @004cef28 case
0xbd8 (raw pseudocode part_014):

- COCKPIT: the 1995 searchlight is a FOG SWAP -- the @00456778/@00456814
  watcher switches DPLRenderer::SetFogStyle between the authored fog= (lit)
  and nosearchlightfog= (dark) sets per map/time page in BTDPL.INI.  The
  engine kept the whole system under its real names; completed the stubbed
  plane application (currentFogNear/Far) and transcribed the watcher (with
  its inverted-cache seed) into TickSearchlight.  CONSEQUENCE: night now
  STARTS on the authentic dark set (near-plane 5u on arena pages) -- our
  builds had rendered the searchlight-ON fog permanently.
- EXTERNAL: spot.bgf beam cone hung on the searchlight SITE joint, shown/
  hidden from the replicated LightOn attribute (@0045612c watcher).  Site
  segments now build geometry-less DCS children (posed + parentable, as the
  1995 graph did) -- previously they were skipped entirely.
- searchlight.hpp: commandedOn @0x1DC identified as mountSegment (resource
  segmentIndex; the cone's mount joint).

Benches: searchfog.sh (solo cockpit: first-tick dark sync, F5/0x14 press ->
SetFogStyle(2), red-fog probe end-to-end), spotcone.sh (2-node: B's button ->
lightState replication -> A logs "[spot] cone SHOWN (seg 20)").  Cone look
(size/aim on the mount) pending an eyeball pass.

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

engine/MUNGA_L4/L4VIDEO.cpp

@@ -4361,6 +4361,12 @@ void
 			fogFar	=	searchLightFogFar;
 			if(fogUpdating)
 			{
+				// BT (searchlight, 2026-08-05): the stubbed dpl_SetViewFog below also
+				// carried the PLANES; the per-frame FOGSTART/FOGEND application reads
+				// currentFogNear/Far, so the swap must land there too (the color line
+				// alone left the fog DISTANCES stuck at load values).
+				currentFogNear = fogNear;
+				currentFogFar  = fogFar;
             mDevice->SetRenderState(D3DRS_FOGCOLOR, D3DCOLOR_XRGB((int)(255 * fogRed), (int)(255 * fogGreen), (int)(255 * fogBlue)));
 	//			dpl_SetViewFog(
 	//				dplMainView,
@@ -4381,6 +4387,8 @@ void
 			fogFar	=	noSearchLightFogFar;
 			if(fogUpdating)
 			{
+				currentFogNear = fogNear;		// see the On case
+				currentFogFar  = fogFar;
             mDevice->SetRenderState(D3DRS_FOGCOLOR, D3DCOLOR_XRGB((int)(255 * fogRed), (int)(255 * fogGreen), (int)(255 * fogBlue)));
 	//			dpl_SetViewFog(
 	//				dplMainView,