fix: precompute runs from /workspace/bin/ (PVC /data/ is read-only for mkdir)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

infra/k8s/argo/compile-and-train-template.yaml

@@ -298,15 +298,11 @@ spec:
         args:
           - |
             set -e
-            # Copy binary from workspace (fetched from GitLab) to PVC
-            mkdir -p /data/bin
-            cp /workspace/bin/precompute_features /data/bin/ 2>/dev/null || true
-            BINARY=/data/bin/precompute_features
+            BINARY=/workspace/bin/precompute_features
             if [ ! -f "$BINARY" ]; then
-              echo "ERROR: precompute_features not found"
+              echo "ERROR: precompute_features not found in /workspace/bin/"
               exit 1
             fi
-            chmod +x "$BINARY"
             $BINARY \
               --data-dir /data/futures-baseline \
               --mbp10-data-dir /data/futures-baseline-mbp10 \