Function scan_view 

pub fn scan_view(
    content: &str,
    filter: ViewFilter,
    normalized_context: &str,
    skip_filter: bool,
    validator_context: &str,
) -> Vec<RegexThreat>

One view pass of _check_regex_patterns: context filter, per-pattern dispatch, validator and binary-density gates, first accepted threat each. Runs with no scan time cap.