cheat.sh/rosetta shows unknown topic, even trought it suggests itself as a topic.

if you try to do
`curl cheat.sh/rosetta`
you get
```
Unknown topic.
Do you mean one of these topics maybe?

* rosetta 100
* c/rosetta/ 82
* d/rosetta/ 82
```
i fear i may be misunderstanding something here, but it appears that this isn't what should happen.

Reproduce the issue with `curl cheat.sh/rosetta`, then trace the topic lookup and suggestion handling in the Python service. Confirm the behavior for `rosetta`, `c/rosetta/`, and `d/rosetta/`; done means the command resolves consistently without reporting the suggested topic as unknown.

Written by the indexing model from the issue text.