feat: define an adapter protocol version number constant

adapterlib/src/lib.rs

@@ -31,6 +31,11 @@ use crate::copy_tree::{CopyTreeError, copy_tree};
 
 mod copy_tree;
 
+/// Version of the broker/adapter protocol used.
+/// This gets put into every [`Request`] message so the adapter can
+/// detect its getting a message it knows how to handle.
+pub const PROTOCOL_VERSION: usize = 1;
+
 /// The type of a run identifier. For maximum generality, this is a
 /// string rather than an integer.
 ///

src/msg.rs

@@ -31,7 +31,7 @@ pub use radicle::{
 };
 pub use radicle_surf::Commit;
 
-pub use radicle_ci_adapter::{Patch, Request, Response, RunId, RunResult};
+pub use radicle_ci_adapter::{PROTOCOL_VERSION, Patch, Request, Response, RunId, RunResult};
 
 use crate::{
     ci_event::{CiEvent, CiEventV1},
@@ -39,10 +39,6 @@ use crate::{
     logger,
 };
 
-// This gets put into every [`Request`] message so the adapter can
-// detect its getting a message it knows how to handle.
-const PROTOCOL_VERSION: usize = 1;
-
 /// Build a [`Request`].
 #[derive(Debug, Default)]
 pub struct RequestBuilder<'a> {