Fix pre-commit: satisfy pyright return type and update uv.lock

- Add unreachable assertion after retry loop to satisfy pyright's
  return-on-all-paths check
- Regenerate uv.lock for lmnr>=0.7.41 dependency

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: simonrosenberg

benchmarks/utils/evaluation.py

@@ -688,9 +688,13 @@ def _process_one_mp(
                     if out is not None:
                         return instance, out
 
-                    # _execute_single_attempt returns None on failure
+                    # _execute_single_attempt returns None on non-final failure
                     retry_count += 1
                     runtime_failure_count += 1
+
+                # Unreachable: _execute_single_attempt always returns EvalOutput
+                # on the final retry, but pyright can't prove the loop exits early.
+                raise AssertionError("unreachable")  # pragma: no cover
             finally:
                 if eval_span is not None:
                     eval_span.end()