Function evaluate_condition 

pub fn evaluate_condition(
    condition: &str,
    variables: &HashMap<String, String>,
) -> Result<bool>

Evaluate a simple template-style condition. Supports:

• {{ var == "value" }}
• {{ var != "value" }}
• {{ 'value' in var }}
• {{ var }} (truthy check)

Variable references are substituted from the supplied variables map before the comparison is run.