SUCCESS: Already fixed - No bug exists

Issue #2 verification complete. The multi-value return handling in expandReturn() is correctly implemented:

1. Code location: pkg/preprocessor/error_prop.go lines 416-430, 519-530
2. Test coverage: pkg/preprocessor/preprocessor_test.go lines 522-639 (all tests pass)
3. Golden test: tests/golden/error_prop_09_multi_value.* (correct output verified)

The code review claim that multi-value returns are dropped is INCORRECT.

Implementation details:
- Lines 416-431: Correctly generates N temporary variables for (T1, T2, ..., TN, error)
- Line 447: Generates __tmp0, __tmp1, ..., __tmpN, __errX := expr
- Line 530: Returns all values: return __tmp0, __tmp1, ..., __tmpN, nil

Example verified in golden test:
  Input:  func parseUserData(input: string) (string, string, int, error) { return extractUserFields(input)? }
  Output: __tmp0, __tmp1, __tmp2, __err3 := extractUserFields(input)
          if __err3 != nil { return "", "", 0, __err3 }
          return __tmp0, __tmp1, __tmp2, nil  ← ALL VALUES RETURNED

Status: NO ACTION REQUIRED
