benchmarks(dsv4-b300-vllm): override trace loader to 060226 (v6)

DSv4 recipes inherit the benchmark_lib carveout that defaults to the
052726 corpus for backward-compat with prior published baselines. This
recipe is opting out to ride the v6 060226 corpus that all non-DSv4
recipes already use, exercising the newer CC versions / longer-tail
trace mix.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: cquil11

benchmarks/single_node/agentic/dsv4_fp4_b300_vllm.sh

@@ -46,6 +46,8 @@ fi
 nvidia-smi
 
 # ---- Resolve traces and install deps ----------------------------------------
+# Opt this recipe out of the DSv4 052726 default; use the v6 corpus.
+export WEKA_LOADER_OVERRIDE=semianalysis_cc_traces_weka_with_subagents_060226
 resolve_trace_source
 install_agentic_deps