Method probe_el_sync

crates/consensus/engine/src/task_queue/core.rs:502–511

Probes the EL with a bare FCU to determine whether a snap-sync is in progress. Unlike [`Engine::reset`], this does not search for a sync starting point — it FCUs to the state the caller already knows reth holds. Used during bootstrap when reth is beyond genesis to distinguish two cases: - `Ok(true)` — reth responded `Valid`: the canonical chain is complete. `el_sync_finished` is set to `true` an

(
        &mut self,
        client: Arc<EngineClient_>,
        config: Arc<RollupConfig>,
        update: EngineSyncStateUpdate,
    )

    /// [`SynchronizeTask`] will detect an identical state and skip the FCU silently,
    /// leaving `el_sync_finished = false`. Always probe before seeding.
    pub async fn probe_el_sync(
        &mut self,
        client: Arc<EngineClient_>,
        config: Arc<RollupConfig>,
        update: EngineSyncStateUpdate,
    ) -> Result<bool, SynchronizeTaskError> {
        SynchronizeTask::new(client, config, update).execute(&mut self.state).await?;
        self.state_sender.send_replace(self.state);
        Ok(self.state.el_sync_finished)
    }

    /// Clears the task queue.
    pub fn clear(&mut self) {