Persist response token usage in rollout history (#41912)

## Why

Resumed threads need to continue per-turn and per-thread token totals without scanning arbitrarily far beyond the latest compaction checkpoint.

## What changed

- Add durable `TokenUsageRecord` rollout items with response, turn, thread, session, and root-turn attribution.
- Restore accumulated usage on resume and snapshot the latest record plus the compaction response ID in compaction checkpoints.
- Preserve root-turn lineage in persisted turn context, while ensuring forked child threads start with their own usage totals.

## Testing

- Cover usage accumulation across multiple responses and resumed turns.
- Cover local and remote compaction checkpoints, invalid remote compaction output, rollout reconstruction, and fork isolation.

GitOrigin-RevId: ef9e0c4a9102a08a2c382be4cdac68c84353c90a

codex-rs/ext/goal/src/api.rs

@@ -276,7 +276,7 @@ impl GoalService {
         };
 
         if let Some(runtime) = runtime.as_ref() {
-            runtime.invalidate_turn_lineage().await;
+            runtime.clear_pending_turn_start_options().await;
         }
 
         if objective.is_some() {
@@ -321,7 +321,7 @@ impl GoalService {
             })?;
         let cleared = cleared_goal.is_some();
         if cleared && let Some(runtime) = runtime.as_ref() {
-            runtime.invalidate_turn_lineage().await;
+            runtime.clear_pending_turn_start_options().await;
         }
         drop(goal_state_permit);
         drop(runtime);

codex-rs/ext/goal/src/runtime.rs

@@ -135,7 +135,7 @@ impl GoalRuntimeHandle {
         self.inner.root_accounting_state.clone()
     }
 
-    pub(crate) async fn invalidate_turn_lineage(&self) {
+    pub(crate) async fn clear_pending_turn_start_options(&self) {
         let Some(thread_manager) = self.inner.thread_manager.upgrade() else {
             return;
         };
@@ -143,9 +143,6 @@ impl GoalRuntimeHandle {
             return;
         };
         thread.thread_extension_data().remove::<TurnStartOptions>();
-        if let Some(turn_id) = self.inner.accounting_state.current_turn_id() {
-            thread.invalidate_turn_lineage(turn_id.as_str()).await;
-        }
     }
 
     pub(crate) async fn goal_state_permit(&self) -> Result<SemaphorePermit<'_>, String> {