fix: argo-precompute.sh uses train workflow + regenerated v2 fxcache

Script rewritten to use argo submit --from=wftmpl/train with
train-epochs=0 — runs ensure-binary + ensure-fxcache only.
Local test fxcache regenerated with FXCACHE_VERSION=2, OFI_DIM=20.

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

scripts/argo-precompute.sh

@@ -1,5 +1,8 @@
 #!/usr/bin/env bash
-# Regenerate fxcache on PVC from MBP-10 + trades data.
+# Regenerate fxcache on PVC — uses the train workflow's ensure-binary + ensure-fxcache steps.
+# Submits a lightweight workflow that compiles the binary and regenerates the feature cache.
+# No GPU needed — runs entirely on ci-compile-cpu.
+#
 # Usage: ./scripts/argo-precompute.sh [--branch main] [--watch]
 set -euo pipefail
 
@@ -12,7 +15,14 @@ while [[ $# -gt 0 ]]; do
     --watch)  WATCH=true; shift;;
     -h|--help)
       echo "Usage: $0 [--branch <branch>] [--watch]"
-      echo "  Regenerates fxcache on PVC with OFI_DIM=20 (20 microstructure features)"
+      echo ""
+      echo "Regenerates fxcache on PVC with current code."
+      echo "Uses ensure-binary + ensure-fxcache from the train workflow."
+      echo "Runs on ci-compile-cpu — no GPU required."
+      echo ""
+      echo "The fxcache auto-invalidates on version mismatch"
+      echo "(FXCACHE_VERSION in fxcache.rs). Old cache is deleted"
+      echo "and regenerated automatically."
       exit 0;;
     *) echo "Unknown option: $1"; exit 1;;
   esac
@@ -22,56 +32,21 @@ echo "=== Argo Precompute fxcache ==="
 echo "  branch: $BRANCH"
 echo ""
 
-WORKFLOW=$(cat <<EOF | kubectl -n foxhunt create -f - -o name
-apiVersion: argoproj.io/v1alpha1
-kind: Workflow
-metadata:
-  generateName: precompute-fxcache-
-spec:
-  entrypoint: precompute
-  volumes:
-    - name: training-data
-      persistentVolumeClaim:
-        claimName: training-data-pvc
-  templates:
-    - name: precompute
-      nodeSelector:
-        k8s.scaleway.com/pool-name: ci-compile-cpu
-      container:
-        image: rg.fr-par.scw.cloud/foxhunt/ci-builder:latest
-        command: ["/bin/bash", "-c"]
-        args:
-          - |
-            set -ex
-            cd /workspace
-            git clone --depth 1 --branch ${BRANCH} ssh://root@100.90.76.85:2222/root/foxhunt.git .
-            rm -f /mnt/training-data/feature-cache/*.fxcache
-            SQLX_OFFLINE=true cargo build -p ml --release --example precompute_features
-            echo "yes" | SQLX_OFFLINE=true ./target/release/examples/precompute_features \\
-              --data-dir /mnt/training-data/futures-baseline \\
-              --mbp10-data-dir /mnt/training-data/futures-baseline-mbp10 \\
-              --trades-data-dir /mnt/training-data/futures-baseline-trades
-            echo "=== Precompute complete ==="
-            ls -lh /mnt/training-data/feature-cache/*.fxcache
-            xxd /mnt/training-data/feature-cache/*.fxcache | head -2
-        volumeMounts:
-          - name: training-data
-            mountPath: /mnt/training-data
-        resources:
-          requests:
-            cpu: "4"
-            memory: "16Gi"
-          limits:
-            cpu: "8"
-            memory: "32Gi"
-      timeout: "30m"
-EOF
-)
+# Submit a training workflow with 0 epochs — it will compile + ensure-fxcache, then stop.
+# hyperopt-trials=0 + train-epochs=0 means only ensure-binary + ensure-fxcache run.
+WORKFLOW_NAME=$(argo submit -n foxhunt --from=wftmpl/train \
+  -p git-branch="$BRANCH" \
+  -p hyperopt-trials=0 \
+  -p train-epochs=0 \
+  -o name 2>&1)
 
-echo "Submitted: $WORKFLOW"
+echo "Submitted: $WORKFLOW_NAME"
+echo "  ensure-binary → ensure-fxcache (compile + regenerate)"
+echo ""
+echo "Monitor: kubectl -n foxhunt logs -f $WORKFLOW_NAME --tail=50"
 
 if $WATCH; then
-  echo "Watching logs..."
-  sleep 5
-  kubectl -n foxhunt logs -f "$WORKFLOW" --tail=50
+  echo ""
+  echo "Watching..."
+  argo watch -n foxhunt "$WORKFLOW_NAME"
 fi