Revert the deliberately failing core test

It proved the APK gate (#5237): run 8667 failed at the core's tests, skipped
the APK job and still dispatched the server image.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

core/src/local/store.rs

@@ -1192,13 +1192,6 @@ mod tests {
         list_notes(conn, &query).expect("list")
     }
 
-    // Throwaway (#5237): proves a red core test stops the APK. Reverted next commit.
-    #[test]
-    fn deliberately_red_for_the_apk_gate() {
-        let n = "x".len();
-        assert_eq!(n, 2, "this test exists to fail");
-    }
-
     fn ids(notes: &[Note]) -> Vec<&str> {
         notes.iter().map(|n| n.id.as_str()).collect()
     }