The Git command you can run to see who most recently changed line 222 of the file `src/app.py` is:

```shell
git blame -L 222 src/app.py
```


This command will show you the commit ID, author, and date of the most recent change to line 222 of the file `src/app.py`.

For example, if the output of the command is:

```shell
commit 1234567890abcdef
Author: John Doe <johndoe@example.com>
Date: 2023-05-14 20:05:36 +0000

Changed line 222
```

Please note that the commit ID, author information, and date will be specific to the actual commit that modified line 222 in the `src/app.py` file.
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