* `examples/minimal_lsp.rs` – compact LSP server showing definition,
completion, hover, rustfmt-based formatting, and dummy diagnostics.
Advertises UTF-8 offset encoding.
* `examples/manual_test.sh` – FIFO script that streams the canonical
nine LSP packets so anyone can validate the server from two terminals.
No new runtime deps; `anyhow` stays under [dev-dependencies].
This makes code more readale and concise,
moving all format arguments like `format!("{}", foo)`
into the more compact `format!("{foo}")` form.
The change was automatically created with, so there are far less change
of an accidental typo.
```
cargo clippy --fix -- -A clippy::all -W clippy::uninlined_format_args
```
