fix(gateway): bound maintenance run expiry checks

src/gateway/server-maintenance.test.ts

@@ -394,6 +394,52 @@ describe("startGatewayMaintenanceTimers", () => {
     stopMaintenanceTimers(timers);
   });
 
+  it("evicts pending accepted agent dedupe entries with invalid run expiry", async () => {
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date("2026-03-22T00:00:00Z"));
+    const { startGatewayMaintenanceTimers } = await import("./server-maintenance.js");
+    const deps = createMaintenanceTimerDeps();
+    const now = Date.now();
+    deps.dedupe.set("agent:invalid-expiry-pending-agent", {
+      ts: now - DEDUPE_TTL_MS - 1,
+      ok: true,
+      payload: {
+        runId: "invalid-expiry-pending-agent",
+        sessionKey: "agent:main:main",
+        status: "accepted",
+        expiresAtMs: Number.POSITIVE_INFINITY,
+      },
+    });
+
+    const timers = startGatewayMaintenanceTimers(deps);
+
+    await vi.advanceTimersByTimeAsync(60_000);
+
+    expect(deps.dedupe.has("agent:invalid-expiry-pending-agent")).toBe(false);
+
+    stopMaintenanceTimers(timers);
+  });
+
+  it("aborts active runs with invalid expiry timestamps", async () => {
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date("2026-03-22T00:00:00Z"));
+    const { startGatewayMaintenanceTimers } = await import("./server-maintenance.js");
+    const deps = createMaintenanceTimerDeps();
+    const runId = "run-invalid-expiry";
+    const activeRun = createActiveRun("main");
+    activeRun.expiresAtMs = Number.POSITIVE_INFINITY;
+    deps.chatAbortControllers.set(runId, activeRun);
+
+    const timers = startGatewayMaintenanceTimers(deps);
+
+    await vi.advanceTimersByTimeAsync(60_000);
+
+    expect(activeRun.controller.signal.aborted).toBe(true);
+    expect(deps.chatAbortControllers.has(runId)).toBe(false);
+
+    stopMaintenanceTimers(timers);
+  });
+
   it("keeps active exec approval dedupe aliases past the normal ttl", async () => {
     vi.useFakeTimers();
     vi.setSystemTime(new Date("2026-03-22T00:00:00Z"));

src/gateway/server-maintenance.ts

@@ -1,6 +1,7 @@
 import type { HealthSummary } from "../commands/health.js";
 import { sweepStaleRunContexts } from "../infra/agent-events.js";
 import { cleanOldMedia } from "../media/store.js";
+import { isFutureDateTimestampMs } from "../shared/number-coercion.js";
 import { abortChatRunById, type ChatAbortControllerEntry } from "./chat-abort.js";
 import { pruneStaleControlPlaneBuckets } from "./control-plane-rate-limit.js";
 import type { ChatRunState } from "./server-chat-state.js";
@@ -124,7 +125,7 @@ export function startGatewayMaintenanceTimers(params: {
         return false;
       }
       const expiresAtMs = (payload as { expiresAtMs?: unknown }).expiresAtMs;
-      return typeof expiresAtMs === "number" && Number.isFinite(expiresAtMs) && expiresAtMs > now;
+      return isFutureDateTimestampMs(expiresAtMs, { nowMs: now });
     };
     const isActiveRunDedupeKey = (key: string, dedupeEntry: DedupeEntry) => {
       if (!key.startsWith("agent:") && !key.startsWith("chat:")) {
@@ -183,7 +184,7 @@ export function startGatewayMaintenanceTimers(params: {
     };
 
     for (const [runId, entry] of params.chatAbortControllers) {
-      if (now <= entry.expiresAtMs) {
+      if (isFutureDateTimestampMs(entry.expiresAtMs, { nowMs: now })) {
         continue;
       }
       abortChatRunById(