[whoalin1]

Summary

Closes #5822

occ encryption:scan:legacy-format is registered by the Default encryption module app. When that app is disabled, occ reports an empty encryption:scan namespace — which looks like the command was removed. Document the enable/scan/disable flow and clarify it is not the End-to-end encryption app.

Test plan

• Docs build for encryption_migration.rst
• With encryption disabled, reproduce the namespace error; with it enabled, command exists

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AI disclosure

This PR was drafted with the help of AI coding assistants (Cursor agents / LLM-based tools), including the description. I am responsible for it and happy to rework anything that doesn't fit.

All commits carry an Assisted-by: Cursor:grok-4.7 trailer.

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[artonge]

Did you faced some issue with it? This Command is only usefull for a really small set of instances that had encryption set up years ago.

[whoalin1]

@artonge No, I did not run into it myself. I picked this up from #5822, where an admin following this page got "There are no commands defined in the encryption:scan namespace" because the Default encryption module app was disabled. I also have not reproduced it on a live instance (that is why the test plan items are unchecked). I went by the issue and the fact that the command is registered by the encryption app.

If you think this note is not worth having for such a small set of instances, I am fine with closing the PR.

AI disclosure: this reply was drafted with help from an AI assistant.