Add migration workflow for agentic workflows from githubnext/gh-aw

- Implemented a GitHub Actions workflow to facilitate the migration of agentic workflows from the githubnext/gh-aw repository.
- The workflow includes steps for normalizing workflow names, fetching workflows and shared dependencies, saving the main workflow, updating source fields, compiling workflows, and reporting results.
- Added error handling and security considerations to ensure safe migration practices.

Author: pelikhan

.github/workflows/maintainer.lock.yml

@@ -10,14 +10,13 @@ network: defaults
 engine: claude
 safe-outputs:
   create-pull-request:
-    draft: false
   create-issue:
-    title-prefix: "${{ github.workflow }}"
 
 tools:
   github:
     toolsets: [repos, issues, pull_requests]
-  bash: [ "*" ]
+  bash:
+    - "*"
 
 timeout_minutes: 30