WIP: switch to announcement, remove extract input mess

tests/parallelism/timing.rs

@@ -1,7 +1,7 @@
 //! Tests for timing and speedup verification
 
 use crate::common::task_fn;
-use dagx::{DagResult, DagRunner, Task};
+use dagx::{DagResult, DagRunner};
 use std::sync::Arc;
 use std::sync::Mutex;
 use std::time::{Duration, Instant};