Wire idle custom agents to matching workflows (#26745)

Author: Copilot

.github/workflows/archie.lock.yml

@@ -12,7 +12,9 @@ permissions:
   issues: read
   pull-requests: read
   actions: read
-engine: copilot
+engine:
+  id: copilot
+  agent: adr-writer
 strict: true
 imports:
   - shared/mcp/serena-go.md

.github/workflows/archie.md

@@ -12,6 +12,10 @@ permissions:
 env:
   TARGET_REPOSITORY: ${{ vars.TARGET_REPOSITORY || github.repository }}
 
+engine:
+  id: copilot
+  agent: contribution-checker
+
 tools:
   mount-as-clis: true
   github:
@@ -252,4 +256,4 @@ If any subagent call failed (❓), also apply `outdated`.
 
 ```json
 {"noop": {"message": "No action needed: [brief explanation of what was analyzed and why]"}}
-```
+```