Add missing TODO comments for featuredetection if-statements

Add greppable TODO identifiers above all if-statements that reference
featuredetection struct fields, as required by the featuredetection
linter. This ensures every feature detection branch is tagged for
future cleanup when GHES gains support.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

pkg/cmd/issue/edit/edit.go

@@ -215,6 +215,7 @@ func editRun(opts *EditOptions) error {
 
 	lookupFields := []string{"id", "number", "title", "body", "url"}
 	if editable.Assignees.Edited {
+		// TODO actorIsAssignableCleanup
 		if issueFeatures.ActorIsAssignable {
 			editable.Assignees.ActorAssignees = true
 			lookupFields = append(lookupFields, "assignedActors")