fix(cron): restore interval cadence after restart

src/cron/service.issue-22895-every-next-run.test.ts

@@ -0,0 +1,51 @@
+import { describe, expect, it } from "vitest";
+import { computeJobNextRunAtMs } from "./service/jobs.js";
+import type { CronJob } from "./types.js";
+
+const EVERY_30_MIN_MS = 30 * 60_000;
+const ANCHOR_MS = Date.parse("2026-02-22T09:14:00.000Z");
+
+function createEveryJob(state: CronJob["state"]): CronJob {
+  return {
+    id: "issue-22895",
+    name: "every-30-min",
+    enabled: true,
+    createdAtMs: ANCHOR_MS,
+    updatedAtMs: ANCHOR_MS,
+    schedule: { kind: "every", everyMs: EVERY_30_MIN_MS, anchorMs: ANCHOR_MS },
+    sessionTarget: "isolated",
+    wakeMode: "next-heartbeat",
+    payload: { kind: "agentTurn", message: "check cadence" },
+    delivery: { mode: "none" },
+    state,
+  };
+}
+
+describe("Cron issue #22895 interval scheduling", () => {
+  it("uses lastRunAtMs cadence when the next interval is still in the future", () => {
+    const nowMs = Date.parse("2026-02-22T10:10:00.000Z");
+    const job = createEveryJob({
+      lastRunAtMs: Date.parse("2026-02-22T10:04:00.000Z"),
+    });
+
+    const nextFromLast = computeJobNextRunAtMs(job, nowMs);
+    const nextFromAnchor = computeJobNextRunAtMs(
+      { ...job, state: { ...job.state, lastRunAtMs: undefined } },
+      nowMs,
+    );
+
+    expect(nextFromLast).toBe(job.state.lastRunAtMs! + EVERY_30_MIN_MS);
+    expect(nextFromAnchor).toBe(Date.parse("2026-02-22T10:14:00.000Z"));
+    expect(nextFromLast).toBeGreaterThan(nextFromAnchor!);
+  });
+
+  it("falls back to anchor scheduling when lastRunAtMs cadence is already in the past", () => {
+    const nowMs = Date.parse("2026-02-22T10:40:00.000Z");
+    const job = createEveryJob({
+      lastRunAtMs: Date.parse("2026-02-22T10:04:00.000Z"),
+    });
+
+    const next = computeJobNextRunAtMs(job, nowMs);
+    expect(next).toBe(Date.parse("2026-02-22T10:44:00.000Z"));
+  });
+});