fix(helper): bind fixture ack to reliable probe

cai

2026-08-12 a640ced9a412100b50b5d9ea0566204b33519bf1

 src/service.rs

@@ -1323,6 +1323,7 @@
            &ControlledFixtureVisibilityEvidence {
                first_visible_bucket: "250_500ms",
                visibility_source: "participant_attributes_poll",
                visibility_result: "held_visible",
                binding_matched: true,
            },
        );
@@ -1330,6 +1331,7 @@
            .expect("post-expiry evidence must enter the production stdout projection");
        assert_eq!(projected["extension"]["first_visible_bucket"], "250_500ms");
        assert_eq!(projected["extension"]["binding_matched"], true);
        assert_eq!(projected["extension"]["visibility_result"], "held_visible");
    }

    #[test]