feat: dagrunner, initial version

dagx-macros/README.md

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+# dagx-macros
+
+Procedural macros for [dagx](https://crates.io/crates/dagx).
+
+This crate provides the `#[task]` attribute macro. You typically don't need to depend on this directly—it's included automatically when you use `dagx`.
+
+## Usage
+
+See the [dagx documentation](https://docs.rs/dagx) for usage examples.
+
+The `#[task]` macro automatically implements the `Task` trait by deriving input and output types from your `run()` method signature.
+
+## License
+
+MIT