Publish harness and TUI open-source

initial sync from the monorepo

crates/codegen/xai-grok-shell/src/util/mod.rs

@@ -0,0 +1,24 @@
+pub mod config;
+pub mod grok_auth_credentials;
+pub mod hooks;
+
+// The foundation utilities live in `xai-grok-shell-base` (upstream of this
+// crate so they build in parallel). Re-exported at the original paths so
+// existing `crate::util::…` / `xai_grok_shell::util::…` users compile
+// unchanged.
+pub use xai_grok_shell_base::util::*;
+
+/// Aborts the wrapped tokio task when dropped.
+///
+/// Use to tie a spawned helper task's lifetime to an async scope so that
+/// cancelling the parent future (e.g. a turn abort dropping the tool loop)
+/// also tears down the helper instead of leaving it running detached.
+/// Aborting an already-finished task is a no-op, so this is safe to hold
+/// across normal scope exit too.
+pub struct AbortOnDrop(pub tokio::task::JoinHandle<()>);
+
+impl Drop for AbortOnDrop {
+    fn drop(&mut self) {
+        self.0.abort();
+    }
+}