fix: align precompute data-dir with train_baseline_rl symbol subdir

precompute passes data-dir/SYMBOL to match how train_baseline_rl
calls load_all_bars(data_dir, symbol). compile-and-train gets
FOXHUNT_FEATURE_CACHE_DIR env var and --epochs fix.

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

infra/k8s/argo/precompute-features-template.yaml

@@ -87,7 +87,8 @@ spec:
             chmod +x "$BINARY"
 
             SYMBOL="{{inputs.parameters.symbol}}"
-            DATA_DIR="{{inputs.parameters.data-dir}}"
+            # Use symbol subdir — must match train_baseline_rl's load_all_bars(data_dir, symbol)
+            DATA_DIR="{{inputs.parameters.data-dir}}/${SYMBOL}"
             MBP10_DIR="{{inputs.parameters.mbp10-dir}}"
             TRADES_DIR="{{inputs.parameters.trades-dir}}"
             OUTPUT_DIR="{{inputs.parameters.output-dir}}"