# Restore the checker formatting gate

Type: task
Status: resolved

## Question

Apply the repository's configured rustfmt output to the currently reported
Rust files, verify that no semantic changes are introduced, and restore
`cargo fmt --all --check` so the checker CI gate is green.

## Answer

The exact CI command failed deterministically on seven Rust files and an
isolated single-file rustfmt check reproduced the same output. The source
changes were formatting-only, but the underlying gate was not reproducible:
the repository had no `rust-toolchain.toml` and checker CI installed floating
`stable`, so local rustfmt, clippy and CI could change independently.

The checker toolchain is now pinned to Rust 1.92.0 with `rustfmt` and `clippy`
in both `rust-toolchain.toml` and the Gitea workflow. The seven files were
formatted with that toolchain. Running the complete CI path then surfaced three
test helpers accepting `&PathBuf` instead of `&Path` and a Clippy name collision
between `Shell` and `PowerShell`; those were corrected without changing CLI
values or behavior.

Verification:

```text
cargo fmt --all --check                         PASS (twice)
cargo clippy --all-targets --all-features -- -D warnings
                                                  PASS
cargo test --all-features --workspace            PASS (53 tests)
cph completions zsh / power-shell                 PASS
```

The final Rust diff consists of rustfmt layout plus four borrowed-Path
signature generalizations and the internal `Shell` → `CompletionTarget` type
rename. No expression, string value, command behavior, or public Rust API was
changed.