Function run_syntax_rules 

pub fn run_syntax_rules(
    root: &Path,
    project_root: &Path,
    filter_rule: Option<&str>,
    filter_tag: Option<&str>,
    filter_ids: Option<&HashSet<String>>,
    config: &RulesConfig,
    debug: &DebugFlags,
    files: Option<&[PathBuf]>,
    path_filter: &PathFilter,
    walk_config: &WalkConfig,
) -> Vec<Finding>

Run syntax rules and return raw findings (no printing).