fix(token-counter): handle non-positive divisor in token estimation

- Changed condition from divisor equals zero to divisor less than or equal to zero
- Prevents division by zero error when estimate_divisor is negative
- Maintains validation logic for invalid divisor values

reme2/component/as_token_counter/estimate_token_counter.py

@@ -19,7 +19,7 @@ class EstimatedTokenCounter(TokenCounterBase):
                 Default 4 assumes roughly 4 characters per token.
                 Use 2-3 for Chinese/Japanese text, 4-5 for English.
         """
-        if estimate_divisor == 0:
+        if estimate_divisor <= 0:
             raise ValueError("estimate_divisor cannot be zero")
         self.estimate_divisor: float = estimate_divisor