Fix linting issues in legacy migrate CLI

Remove test migration file and fix formatting issues found by flake8.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: abrookins

aredis_om/model/cli/legacy_migrate.py

@@ -60,7 +60,9 @@ async def _status():
     click.echo("Pending Automatic Migrations:")
     for migration in migrations:
         action = "CREATE" if migration.action.name == "CREATE" else "DROP"
-        click.echo(f"  {action}: {migration.index_name} (model: {migration.model_name})")
+        click.echo(
+            f"  {action}: {migration.index_name} (model: {migration.model_name})"
+        )
 
 
 @migrate.command()
@@ -118,4 +120,4 @@ async def _run():
             )
         return len(migrator.migrations)
 
-    run_async(_run())
+    run_async(_run())