Function find_bridge_param 

pub fn find_bridge_param<'a>(
    func: &FunctionDef,
    bridges: &'a [TraitBridgeConfig],
) -> Option<(usize, &'a TraitBridgeConfig)>

Find the first function parameter that matches a trait bridge configuration (by type alias or parameter name).

Bridges configured with bind_via = "options_field" are skipped — they live on a struct field rather than directly as a parameter, and are returned by find_bridge_field instead.