Previously, tests were included by `app.rs` which is the entrypoint
for intgration tests, but there were also loose `.rs` files which
each count as separate test (with their own binary).
This wasn't intended and I don't know what happened there,
so now `core.rs` is the entrypoint.
This is done one-time (for now) using a nightly feature of cargo-fmt
as defined in `rustfmt-nightly.toml.`
It's planned to make this the default so imports will always be sorted.
For now it can be run manually with:
cargo +nightly fmt -- --config-path rustfmt-nightly.toml
or
pnpm rustfmtTBD
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