diff --git a/docs/superpowers/plans/2026-04-24-dqn-v2-plan-3-behavioural.md b/docs/superpowers/plans/2026-04-24-dqn-v2-plan-3-behavioural.md
index 762017ed3..9b8841248 100644
--- a/docs/superpowers/plans/2026-04-24-dqn-v2-plan-3-behavioural.md
+++ b/docs/superpowers/plans/2026-04-24-dqn-v2-plan-3-behavioural.md
@@ -1297,10 +1297,12 @@ impl AdaptiveController for CqlAlphaSeedCoupledController {
     type Signal = f32;  // current seed fraction in replay buffer
     type Control = f32; // cql_alpha
 
-    fn read_signals(&self, _isv: &IsvBus) -> Self::Signal {
-        // Producer: replay buffer tracks seed-origin vs. dqn-origin count.
-        // That's exposed via an existing counter; controller reads it.
-        unimplemented!("plumbed by caller")
+    fn read_signals(&self, isv: &IsvBus) -> Self::Signal {
+        // Producer: replay buffer tracks seed-origin vs. dqn-origin count
+        // and writes the current seed fraction into ISV slot
+        // SEED_FRACTION_EMA_INDEX (a Plan 1 reserved controller-signal slot).
+        // Here we just read it back.
+        isv.read(SEED_FRACTION_EMA_INDEX)
     }
 
     fn update(&mut self, seed_fraction: f32) -> f32 {