feat(*): Add exported Linux binary training path for faster parallel instances

training/run_training.sh

@@ -16,10 +16,28 @@ shift
 # Train on the latest code and checkpoints from any machine
 git pull --rebase
 
+# Rebuild the exported training binary against the code we just pulled, so a
+# --exported-binary run never trains on a stale snapshot. Only when the
+# caller has already opted into the exported-binary flow (training/build/
+# exists from a prior export) — a source-run caller pays no extra latency.
+# Fails the whole run rather than silently falling through to train.py
+# against a stale or partially-rebuilt binary (export_linux.sh sets -e, but
+# that only exits *it*, not this script).
+EXTRA_ARGS=()
+if [ -d build ]; then
+    ./export_linux.sh || { echo "export_linux.sh failed — aborting" >&2; exit 1; }
+    # Standing entry points (next_run.sh, curriculum.py) don't know about the
+    # exported binary and never pass --exported-binary themselves; default it
+    # here so opting in (by ever running export_linux.sh once) actually gets
+    # used, not just kept up to date. An explicit --exported-binary in "$@"
+    # still wins (argparse: later occurrence overrides).
+    EXTRA_ARGS=(--exported-binary build/CosmicClash.x86_64)
+fi
+
 # Let Ctrl-C stop train.py without killing this script, so the export and
 # commit below still run
 trap ':' INT
-.venv/bin/python train.py --experiment "$EXP" "$@"
+.venv/bin/python train.py --experiment "$EXP" "${EXTRA_ARGS[@]}" "$@"
 trap - INT
 
 if [ ! -f "checkpoints/$EXP/final.zip" ]; then