fix: account hook system item appends

crates/llm-worker/src/interceptor.rs

@@ -42,6 +42,12 @@ pub enum PreRequestAction {
     /// to: the items are committed before the request so later turns can see
     /// why the worker changed course.
     ContinueWith(Vec<Item>),
+    /// Yield after appending these items to durable worker history.
+    ///
+    /// This is for host-mediated pre-request appends that must be visible to
+    /// usage accounting and compaction checks before the current LLM request is
+    /// allowed to proceed.
+    YieldWith(Vec<Item>),
     /// Cancel with a reason (treated as an error).
     Cancel(String),
     /// Yield control to the caller for external processing.

crates/llm-worker/src/worker.rs

@@ -1177,6 +1177,16 @@ impl<C: LlmClient, S: WorkerState> Worker<C, S> {
                     self.last_run_interrupted = true;
                     return Err(WorkerError::Aborted(reason));
                 }
+                PreRequestAction::YieldWith(items) => {
+                    self.append_history_items(items.clone());
+                    request_context.extend(items);
+                    info!("Yielded by interceptor after pre-request history append");
+                    for cb in &self.turn_end_cbs {
+                        cb(current_turn);
+                    }
+                    self.last_run_interrupted = true;
+                    return Ok(WorkerResult::Yielded);
+                }
                 PreRequestAction::Yield => {
                     info!("Yielded by interceptor");
                     for cb in &self.turn_end_cbs {