feat: dagrunner, initial version

benches/basic/creation.rs

@@ -0,0 +1,30 @@
+//! DAG creation benchmarks
+
+use criterion::Criterion;
+use dagx::{DagRunner, Task};
+use std::hint::black_box;
+
+// Simple task for benchmarking
+struct Value(i32);
+
+#[dagx::task]
+impl Value {
+    async fn run(&self) -> i32 {
+        self.0
+    }
+}
+
+pub fn bench_dag_creation(c: &mut Criterion) {
+    c.bench_function("create_empty_dag", |b| {
+        b.iter(|| black_box(DagRunner::new()));
+    });
+
+    c.bench_function("add_100_tasks", |b| {
+        b.iter(|| {
+            let dag = DagRunner::new();
+            for i in 0..100 {
+                black_box(dag.add_task(Value(i)));
+            }
+        });
+    });
+}