End-to-end tests for the `scell` binary. They spawn the real binary via a PTY using [pexpect](https://pexpect.readthedocs.io).
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```bash
SCELL_BIN=/path/to/scell uv run pytest
```
`SCELL_BIN` must point to the `scell` binary. There is no default — the tests will fail immediately with a clear message if it is not set.