build(crt-train): register smoothness_lambda_controller.cu in build.rs

crates/ml-alpha/build.rs

@@ -22,9 +22,10 @@ const KERNELS: &[&str] = &[
     "attention_pool",                // Phase 3: single-Q learned content summary at CfC k=0
     "reduce_axis0",                  // Phase B: cross-batch param-grad reducer
     "output_smoothness",             // CRT.train: per-horizon adjacent-position prob-jitter penalty
+    "smoothness_lambda_controller",  // CRT.train: ISV-driven λ controller anchored on h30 jitter
 ];
 
-// Cache bust v12 (2026-05-20): output_smoothness.cu added — CRT.train intervention A.
+// Cache bust v13 (2026-05-21): smoothness_lambda_controller.cu added — ISV-driven λ.
 
 fn main() {
     println!("cargo:rerun-if-changed=build.rs");