fix(ci): hardened logger probe timeouts and silenced async trait lint

- Raised probe-spawning logger tests to 30s timeouts; bun's 5s default
  SIGTERMed probe children (exit 143) on shared-core CI runners, matching
  the precedent documented in logger-contract.test.ts.
- Allowed clippy::unused_async_trait_impl on KillCommand::execute with an
  unknown_lints guard for the pinned CI nightly that predates the lint.

crates/pi-shell/src/shell.rs

@@ -3782,6 +3782,11 @@ impl KillSignal {
 impl builtins::Command for KillCommand {
 	type Error = brush_core::Error;
 
+	#[allow(unknown_lints, reason = "unused_async_trait_impl is unknown to the pinned CI nightly")]
+	#[allow(
+		clippy::unused_async_trait_impl,
+		reason = "the builtin Command trait declares execute as async"
+	)]
 	async fn execute<SE: brush_core::ShellExtensions>(
 		&self,
 		context: ExecutionContext<'_, SE>,