fix: Argo precompute uses --symbol filter (no double-nested data-dir)

Previously appended /${SYMBOL} to data-dir AND passed --symbol, causing
double nesting. Now data-dir stays as-is and --symbol handles filtering
via collect_dbn_files_filtered.

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

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

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