Merge pull request 'fix: fix: evolve.sh silences all batch-eval errors with 2>/dev/null (#749)' (#765) from fix/issue-749 into master

STATE.md

@@ -25,3 +25,4 @@
 - [2026-03-14] EVAL_MODE now defaults to revm (#751)
 - [2026-03-14] LLM seed — Defensive Floor Hugger optimizer (#672)
 - [2026-03-14] evolve.sh stale tmpdirs break subsequent runs (#750)
+- [2026-03-14] evolve.sh silences all batch-eval errors with 2>/dev/null (#749)

tools/push3-evolution/evolve.sh

@@ -462,9 +462,16 @@ for gen in $(seq 0 $((GENERATIONS - 1))); do
 
     if [ "${#_BATCH_FILES[@]}" -gt 0 ]; then
       BATCH_EC=0
-      bash "$BATCH_EVAL_SH" "${_BATCH_FILES[@]}" > "$BATCH_SCORES_FILE" 2>/dev/null \
+      BATCH_EVAL_LOG="$WORK_DIR/batch-eval-gen-${gen}.log"
+      bash "$BATCH_EVAL_SH" "${_BATCH_FILES[@]}" > "$BATCH_SCORES_FILE" 2>"$BATCH_EVAL_LOG" \
         || BATCH_EC=$?
 
+      if [ "$BATCH_EC" -ne 0 ]; then
+        echo "--- last 20 lines of $BATCH_EVAL_LOG ---" >&2
+        tail -n 20 "$BATCH_EVAL_LOG" >&2
+        echo "--- end batch-eval.log ---" >&2
+      fi
+
       if [ "$BATCH_EC" -eq 2 ]; then
         fail "batch-eval.sh reported an infrastructure error (exit 2) — aborting evolution"
       fi