diff --git a/packages/runner/src/executor/space-server.ts b/packages/runner/src/executor/space-server.ts
index 4dec567a57..3d5966dcd1 100644
--- a/packages/runner/src/executor/space-server.ts
+++ b/packages/runner/src/executor/space-server.ts
@@ -2453,9 +2453,11 @@ export class SpaceServer implements TransactionSealDestination {
    * the events.md §5 DROP and clears the park criterion). */
   #armDeferredRescan(): void {
     if (this.#deferredRescanTimer !== undefined) return;
+    this.#options.stats.events.deferredRescansArmed += 1;
     this.#deferredRescanTimer = setTimeout(() => {
       this.#deferredRescanTimer = undefined;
       if (!this.#active) return;
+      this.#options.stats.events.deferredRescansFired += 1;
       this.#eventScanOwed = true;
       this.#feedArrived?.resolve();
     }, EVENT_DEFERRAL_REARM_MS);
diff --git a/packages/runner/src/executor/stats.ts b/packages/runner/src/executor/stats.ts
index 0c418d518a..d44784fee1 100644
--- a/packages/runner/src/executor/stats.ts
+++ b/packages/runner/src/executor/stats.ts
@@ -369,6 +369,21 @@ export type ServingLoopStats = {
      * register's owed follow-up on the OW45 row. */
     preQueueDeferralStuck: number;
 
+    /** Ordered publication/response barriers attempted for lagging event views. */
+    visibilityBarriers: number;
+
+    /** Event identities visible at the recomputed index after a barrier. */
+    visibilityRecoveries: number;
+
+    /** Drain passes stopped by an event view still missing its stored identity. */
+    visibilityDeferrals: number;
+
+    /** Deferral backstops scheduled across all transient drain outcomes. */
+    deferredRescansArmed: number;
+
+    /** Deferral backstops that fired during an active serving tenure. */
+    deferredRescansFired: number;
+
     /** Stage C build W3, (α1) — events.md §4's RULED one-entry-one-
      * completed-run sentence: LT1 same-space in-process copies (`served
      * !== undefined && served.streamEntry === undefined`) the flush
@@ -593,6 +608,11 @@ export const emptyServingLoopStats = (): ServingLoopStats => ({
     skippedIdempotent: 0,
     drainInFlightSkips: 0,
     preQueueDeferralStuck: 0,
+    visibilityBarriers: 0,
+    visibilityRecoveries: 0,
+    visibilityDeferrals: 0,
+    deferredRescansArmed: 0,
+    deferredRescansFired: 0,
     lt1LeftoversPurged: 0,
     lt1LateSealsRefused: 0,
     orphanDeliveriesRefused: 0,
diff --git a/packages/runner/src/storage/interface.ts b/packages/runner/src/storage/interface.ts
index 1b556046b3..33a6ebfcb5 100644
--- a/packages/runner/src/storage/interface.ts
+++ b/packages/runner/src/storage/interface.ts
@@ -688,6 +688,13 @@ export interface IStorageProvider {
   /** Establish the authenticated space session without reading entity values. */
   ensureSession?(): Promise<void>;
 
+  /**
+   * Wait for an ordered response after this space's published input frames.
+   * Frame application completes before the response; pending local writes may
+   * still shadow those inputs. This does not wait for commit durability.
+   */
+  pullToServerHead?(): Promise<void>;
+
   /** List live space-scoped entity identifiers without loading their values. */
   listEntityIds?(): Promise<string[] | undefined>;