Ensure nightly reverts any changes before checking out next run. (#1179)

Author: erikfrey

benchmarks/nightly.sh

@@ -105,6 +105,9 @@ COMMITS=$(git rev-list --reverse "${LAST_COMMIT}..HEAD")
 for commit in $COMMITS; do
     log "Processing commit $commit"
 
+    # Reset working tree (uv run may modify uv.lock)
+    git restore .
+
     # Checkout the commit
     git checkout "$commit" 2>&1 | log