Gauges: trigger-config joystick is LIVE -- @004c6ee0 is LinkToEntity, not SetColor

The weapon panel's btjoy trigger-config display (ConfigMapGauge) never rendered
because the reconstruction labelled @004c6ee0 as "SetColor(int)" and, finding no
caller, concluded the gauge was authentically dormant (task #6), gating it
behind a BT_CONFIGMAP dev env.

The user challenged this (the PROGRAM/TRIGGER CONFIG button implies the display
visualizes your config).  Re-verification found the old analysis failed twice:
the "no caller" search looked for direct calls to a VIRTUAL, and its slot math
used the wrong vtable copy.  The real ConfigMapGauge vtable @0051a1b8, matched
against the T0 GaugeBase virtual roster (GAUGE.h), pins @004c6ee0 at slot 9
(+0x24) == GaugeBase::LinkToEntity, and @0x94 is the linkedEntity -- the
Execute gate is "not yet linked", not "disabled".  The engine broadcasts
LinkToEntity(viewpointEntity) to every gauge at viewpoint bind (APP.cpp:1277 ->
GaugeRenderer::LinkToEntity GAUGREND.cpp:3011), arming the gate -- the joystick
DOES render in the shipped game, showing per-trigger mapping state (solid =
mapped, matching the DOSBox reference).

Port fix: SetColor(int color) -> LinkToEntity(Entity*), color -> linkedEntity,
BT_CONFIGMAP dev enable deleted (the authentic path lights it).  Render-verified
with no env override: the joystick + mapped-trigger lamp draw on weapon panels.

KB swept per the correction mandate: gauges-hud.md, decomp-reference.md,
open-questions.md, GAUGE_COMPOSITE.md, VEHICLE_SUBSYSTEMS.md.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/GAUGE_COMPOSITE.md

@@ -676,7 +676,7 @@ reconfigure/externalConfigure); parse-skip list EMPTY ([gskip]=0), all 50 attr b
 | 12 | Quad mini-panels: temp bars / cooling-loop / power-bus lamps / evolt bar / cmode lamp | SubsystemCluster children (@004c8140 map) reading InputVoltage/HeatSink/temps | VEHICLE_SUBSYSTEMS.md phase 2; LIVE: panels render per-subsystem, [vss] roster matches authored aux screens 1-10 | T2 | CORRECT |
 | 13 | Quad: recharge dial (SegmentArc270) | PercentDone → rechargeLevel@0x320 | ~~writer census: Emitter::ComputeOutputVoltage @004ba738 only — projectile dial full-once~~ **CORRECTED (Gitea #12, 2026-07-19): the census missed vtbl slot 17 @004b9c9c** — `rechargeLevel=(rechargeRate−recoil)/rechargeRate`, called per frame by the recovered @004bbd04 Loading/state-7 cases: the projectile dial authentically ANIMATES through reload (port fix pending — the port sim never calls slot 17) | T1 | CORRECT (emitters) + **WRONG-STATIC (projectile; fix pending)** |
 | 14 | Quad: ammo count (ammoCountA) | AmmoBin::ammoCount via BTAmmoBinCountPtr bridge | AFC100 fix 2026-07-12; LIVE: 24 fresh (audit4) vs 19 after missile autofire (audit3) — counter moves | T2 | CORRECT |
-| 15 | Quad: ConfigMap regroup lamps | LBE4ControlsManager buttonGroup map state | task #6: NO SetColor caller in the binary → color=0, Execute early-outs | T1 | AUTH-STATIC (dormant; BT_CONFIGMAP dev enable) |
+| 15 | Quad: ConfigMap regroup lamps | LBE4ControlsManager buttonGroup map state | CORRECTED 2026-07-21: @004c6ee0 is the LinkToEntity override (not SetColor); armed at viewpoint bind → LIVE | T1 | LIVE (authentic LinkToEntity path; BT_CONFIGMAP deleted) |
 | 16 | Eng pages: prepEngr SYSTEM NN + subsystem label + class cells | roster walk, sub+0x1dc auxScreen == screen (BTGetSubsystemAuxScreen) | FUN_004c7e48 matched line-by-line; [vss] dump: scr1/2/4=PPC/Strk6/ERMed, 5-8=Sens/Myo/ERMed/ERMed, 9/10=Strk6/PPC — page headers+labels CORRECT | T1/T2 | CORRECT |
 | 17 | Eng ballistic page: ammoCountB / jam / fire / reload numeric / destroyed lamp | bin count bridge + weaponAlarm@0x364 (MechWeapon layout static_assert-locked) | ctor @004c9558 coords matched; LIVE renders | T2 | CORRECT |
 | 18 | Eng ballistic page: eject wipe (BitMapInverseWipeScalar @004c61c8) | subsys+0x3f8 eject timer | port tracked NULL (class not reconstructed) | T3 | DEFERRED-FEED |