Definition
/**
* Create a raw SQL condition (use with caution).
*
* SECURITY WARNING: This function accepts raw SQL without parameterization.
* SQL injection is possible if used with untrusted user input.
* Only use with trusted, validated input.
*
* For user-provided values, use standard condition functions with param():
* ```php
* // UNSAFE - SQL injection possible:
* raw_cond("status = '" . $userInput . "'")
*
* // SAFE - use typed conditions:
* eq(col('status'), param(1))
* ```
*/
raw_cond(string $sql) : RawCondition