test: add migration-test repository for transfer automation testing

Add worlddriven-migration-test to REPOSITORIES.md with Origin field
to test the repository transfer automation workflow.

This will verify:
- Drift detection correctly identifies pending transfer
- Permission check detects worlddriven-migrate app installation
- CI rerun triggers when app is installed
- Sync workflow executes transfer on merge

Author: TooAngel

REPOSITORIES.md

@@ -116,3 +116,8 @@ Track implementation progress in GitHub issue #9.
 ## webapp
 - Description: Web application interface for worlddriven
 - Topics: webapp, web, frontend, worlddriven
+
+## migration-test
+- Description: Test repository for worlddriven migration automation
+- Topics: test, migration, worlddriven
+- Origin: TooAngel/worlddriven-migration-test