Γ-W1-T2: the published GR meter reads the limiter, not the mute

Retire the effectiveGain blend so the meter's minimum tracks smoothGain's own
reduction against real input, unscaled by the transition mute — a toggle over
quiet material now reads no reduction instead of pinning to 0.

src/core/instrument/engine/limiter.cpp

@@ -197,8 +197,10 @@ float Limiter::process(float* left, float* right, int frames) {
             left[i] = 0.f;
             if (stereo) right[i] = 0.f;
         }
-        const float effectiveGain = s >= 1.f ? gain : s * gain;
-        if (effectiveGain < blockMin) blockMin = effectiveGain;
+        // `gain` is the limiter's own reduction, computed from the real input this sample
+        // whether or not the mute is currently scaling it toward silence — publishing it
+        // unscaled is what lets the meter show "really limiting" and not "just muting".
+        if (gain < blockMin) blockMin = gain;
 
         // A disengage is tested FIRST so a toggle-off arriving mid-engage abandons the prime
         // instead of waiting it out in silence.