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, 1 insertions, 1 deletions

diff --git a/test/Cargo.toml b/test/Cargo.toml
index b92b54b..68a4698 100644
--- a/test/Cargo.toml
+++ b/test/Cargo.toml
@@ -1,3 +1,3 @@
 [workspace]
-members = ["sync", "async"]
+members = ["sync", "async", "no_metadata"]
 resolver = "2"