975c836015
- Replaced baked module-load value with per-call `isWebPExcluded()` so runtime env changes take effect. - Only `"1"` and `"true"` (case-insensitive) enable exclusion; empty string and `"0"` are treated as disabled. - Fast path now bypassed for WebP sources when exclusion is active. - Explicit error surfaced when decode fails and WebP exclusion cannot be honored.