fix(runtime): merge identical session load match arms

Resolves clippy::match_same_arms in session.rs.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

rust/crates/runtime/src/session.rs

@@ -168,8 +168,7 @@ impl Session {
             {
                 Self::from_json(&value)?
             }
-            Err(_) => Self::from_jsonl(&contents)?,
-            Ok(_) => Self::from_jsonl(&contents)?,
+            Err(_) | Ok(_) => Self::from_jsonl(&contents)?,
         };
         Ok(session.with_persistence_path(path.to_path_buf()))
     }