add TODO

.github/workflows/src/summarize-checks/summarize-checks.js

@@ -1,3 +1,3 @@
 // @ts-check
 
 /*
@@ -292,6 +292,8 @@
     return;
   }
 
+  // TODO: This is triggered by pull_request_target AND workflow_run.  If workflow_run, targetBranch will be undefined.
+  //       Is this OK? If not, we should be able to get the base ref by calling a GH API to fetch the PR metadata.
   const targetBranch = context.payload.pull_request?.base?.ref;
   core.info(`PR target branch: ${targetBranch}`);