fix(run-rs-task): always ran fmt:rs regardless of Rust-affecting changes

- Exempted the `fmt:rs` task from the early-exit skip logic so formatting always runs.
- Reformatted `apply_command_env` signature in shell.rs to satisfy the formatter.

crates/pi-shell/src/shell.rs

@@ -1045,7 +1045,10 @@ fn terminate_background_jobs(shell: &BrushShell) {
 /// `Command` scope. Returns `true` when a scope was pushed (so the caller
 /// can pop it after the command runs), `false` when there were no vars and
 /// the existing scopes remain untouched.
-fn apply_command_env(shell: &mut BrushShell, env: Option<&HashMap<String, String>>) -> Result<bool> {
+fn apply_command_env(
+	shell: &mut BrushShell,
+	env: Option<&HashMap<String, String>>,
+) -> Result<bool> {
 	let Some(env) = env else {
 		return Ok(false);
 	};

scripts/run-rs-task.ts

@@ -48,7 +48,7 @@ if (!isRustTaskName(taskName)) {
 	process.exit(1);
 }
 
-if (!(isCI() || (await hasRustAffectingChanges()))) {
+if (taskName !== "fmt:rs" && !(isCI() || (await hasRustAffectingChanges()))) {
 	console.log(`Skipping ${taskName} (not in CI and no Rust-affecting changes were found).`);
 	process.exit(0);
 }