fix(plan): reviewer round 3 — tggn/tgnn module mapping, exit code, canonical imports

- B1: Add LIB_FILTER mapping for tggn→tgnn module name (prevents zero-test false positive)
- W1: Replace ml_supervised:: imports with canonical ml:: paths in supervised_gpu_smoke_test
- W4: Use clean pass/fail exit code instead of raw failure count

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/superpowers/plans/2026-03-13-gpu-test-workflow.md

@@ -610,7 +610,7 @@ fn test_tft_gpu_smoke() {
     println!("=== TFT GPU Smoke ===");
 
     use ml::tft::trainable_adapter::TrainableTFT;
-    use ml_supervised::tft::TFTConfig;
+    use ml::tft::TFTConfig;
 
     let feature_dim = 10;
     let mut config = TFTConfig::default();
@@ -647,7 +647,7 @@ fn test_mamba2_gpu_smoke() {
     println!("=== Mamba2 GPU Smoke ===");
 
     use ml::mamba::trainable_adapter::Mamba2TrainableAdapter;
-    use ml_supervised::mamba::Mamba2Config;
+    use ml::mamba::Mamba2Config;
 
     let mut config = Mamba2Config::default();
     config.d_model = 32;
@@ -674,7 +674,7 @@ fn test_tggn_gpu_smoke() {
     println!("=== TGGN GPU Smoke ===");
 
     use ml::tgnn::trainable_adapter::TGGNTrainableAdapter;
-    use ml_supervised::tgnn::TGGNConfig;
+    use ml::tgnn::TGGNConfig;
 
     let config = TGGNConfig {
         node_dim: 10,
@@ -733,7 +733,7 @@ fn test_liquid_gpu_smoke() {
     println!("=== Liquid GPU Smoke ===");
 
     use ml::liquid::adapter::LiquidTrainableAdapter;
-    use ml_supervised::liquid::candle_cfc::CfCTrainConfig;
+    use ml::liquid::CfCTrainConfig;
     use ml::gpu::DeviceConfig;
 
     let config = CfCTrainConfig {
@@ -794,7 +794,7 @@ fn test_xlstm_gpu_smoke() {
     println!("=== xLSTM GPU Smoke ===");
 
     use ml::xlstm::trainable::XLSTMTrainableAdapter;
-    use ml_supervised::xlstm::config::XLSTMConfig;
+    use ml::xlstm::config::XLSTMConfig;
 
     let config = XLSTMConfig {
         input_dim: 10,
@@ -1160,8 +1160,11 @@ spec:
                   ;;
                 *)
                   # Supervised models (TFT, Mamba2, TGGN, TLOB, Liquid, KAN, xLSTM, Diffusion)
+                  # Map model names to Rust module names where they differ
+                  LIB_FILTER="$MODEL"
+                  [ "$MODEL" = "tggn" ] && LIB_FILTER="tgnn"
                   if [ "$SCOPE" = "lib" ] || [ "$SCOPE" = "all" ]; then
-                    run_tests "${MODEL}-lib" cargo test -p ml --features cuda --lib -- "$MODEL"
+                    run_tests "${MODEL}-lib" cargo test -p ml --features cuda --lib -- "$LIB_FILTER"
                   fi
                   if [ "$SCOPE" = "integration" ] || [ "$SCOPE" = "all" ]; then
                     run_tests "${MODEL}-gpu" cargo test -p ml --features cuda --test supervised_gpu_smoke_test -- "test_${MODEL}_gpu_smoke"
@@ -1192,7 +1195,7 @@ spec:
             printf "$RESULTS" > /tmp/outputs/results
             echo "$FAILURES" > /tmp/outputs/failures
 
-            exit $FAILURES
+            [ "$FAILURES" -gt 0 ] && exit 1 || exit 0
 
     # ── notify-result: post test outcome to Mattermost (onExit) ──
     - name: notify-result