feat(test): add fallback test crate for no-metadata buildsHEADmain

Add `might_be_async_test_fallback` crate in `test/no_metadata/` to
verify macro behavior when the `metadata_async` feature is absent,
covering sync/async select, invoke, and bare func attributes

1 files changed, 11 insertions, 0 deletions

diff --git a/test/no_metadata/Cargo.toml b/test/no_metadata/Cargo.toml
new file mode 100644
index 0000000..e228ecb
--- /dev/null
+++ b/test/no_metadata/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "might_be_async_test_fallback"
+version = "0.1.0"
+edition = "2024"
+
+[features]
+async = []
+
+[dependencies]
+might_be_async = { path = "../.." }
+futures = "0.3"