fix: impl-review + merge on Sonnet/best-practices-opus-repo (unclaimable routing + empty-delivery risk)

task-templates/workflow/impl-review-sonnet@1.yaml

@@ -1,7 +1,7 @@
 name: impl-review-sonnet
 version: 1
 description: Code review of implementation using Sonnet code-review
-runtime: best-practices-airouter-repo
+runtime: best-practices-opus-repo
 input:
   state: integrated
   tags_forbidden: []
@@ -15,7 +15,8 @@ scope_budget:
 nodes:
   - id: agent
     kind: agent
-    template: best-practices-airouter-repo
+    template: best-practices-opus-repo
+    model: sonnet
     prompt: |
       Code-review the implementation for the following task.