chore: enable clippy::redundant_clone (#3489)

Created this PR by:

- adding `redundant_clone` to `[workspace.lints.clippy]` in
`cargo-rs/Cargol.toml`
- running `cargo clippy --tests --fix`
- running `just fmt`

Though I had to clean up one instance of the following that resulted:

```rust
let codex = codex;
```

codex-rs/tui/src/history_cell.rs

@@ -697,7 +697,7 @@ fn spinner(start_time: Option<Instant>) -> Span<'static> {
 
 pub(crate) fn new_active_mcp_tool_call(invocation: McpInvocation) -> PlainHistoryCell {
     let title_line = Line::from(vec!["tool".magenta(), " running...".dim()]);
-    let lines: Vec<Line> = vec![title_line, format_mcp_invocation(invocation.clone())];
+    let lines: Vec<Line> = vec![title_line, format_mcp_invocation(invocation)];
 
     PlainHistoryCell { lines }
 }
@@ -1324,7 +1324,7 @@ fn format_mcp_invocation<'a>(invocation: McpInvocation) -> Line<'a> {
     let invocation_spans = vec![
         invocation.server.clone().cyan(),
         ".".into(),
-        invocation.tool.clone().cyan(),
+        invocation.tool.cyan(),
         "(".into(),
         args_str.dim(),
         ")".into(),