714b4712ad
Settings::register_classifier_filters() registers priority-5 callbacks on cf7stg_classifier_thresholds and cf7stg_hard_drop_rules so the UI options actually influence Classifier behaviour. Called from Plugin::boot(). User filters at priority 10 override these defaults as expected. Adds 4 tests covering the wired behaviour and override priority. Also adds dry_run_drop? to MessageFormatter::build() @param docblock. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>