docs(readme): link the QQQ adoption checklist

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: James Maes <james@kof22.com>

README.md

@@ -167,6 +167,8 @@ A checklist for adding the workbench to a QQQ application. Each row points to th
 
 Nothing in the qbit is specific to one host application.
 
+See also the [QQQ adoption checklist](https://github.com/QRun-IO/qqq/blob/develop/docs/migration/adoption-checklist.adoc) for the full per-feature list (QQQ upgrade, Next dashboard, QBits, migrations, permissions).
+
 ## Build
 
 ```bash