WIP: switch to announcement, remove extract input mess

Cargo.lock

@@ -32,6 +32,15 @@ version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4b46cbb362ab8752921c97e041f5e366ee6297bd428a31275b9fcf1e380f7299"
 
+[[package]]
+name = "announcement"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0e58b38a7f1ae19278fb8b7aa4c3ac3957f0e6389a132522789b1dd2e1912189"
+dependencies = [
+ "event-listener 5.4.1",
+]
+
 [[package]]
 name = "anstyle"
 version = "1.0.13"
@@ -436,6 +445,7 @@ dependencies = [
 name = "dagx"
 version = "0.3.0"
 dependencies = [
+ "announcement",
  "async-executor",
  "async-std",
  "async-trait",