feat(cron): enhance one-shot job behavior and CLI options

- Default one-shot jobs to delete after success, improving job management.
- Introduced `--keep-after-run` CLI option to allow users to retain one-shot jobs post-execution.
- Updated documentation to clarify default behaviors and new options for one-shot jobs.
- Adjusted cron job creation logic to ensure consistent handling of delete options.
- Enhanced tests to validate new behaviors and ensure reliability.

This update streamlines the handling of one-shot jobs, providing users with more control over job persistence and execution outcomes.

src/cron/normalize.test.ts

@@ -111,6 +111,22 @@ describe("normalizeCronJobCreate", () => {
     expect(schedule.atMs).toBe(Date.parse("2026-01-12T18:00:00Z"));
   });
 
+  it("defaults deleteAfterRun for one-shot schedules", () => {
+    const normalized = normalizeCronJobCreate({
+      name: "default delete",
+      enabled: true,
+      schedule: { at: "2026-01-12T18:00:00Z" },
+      sessionTarget: "main",
+      wakeMode: "next-heartbeat",
+      payload: {
+        kind: "systemEvent",
+        text: "hi",
+      },
+    }) as unknown as Record<string, unknown>;
+
+    expect(normalized.deleteAfterRun).toBe(true);
+  });
+
   it("normalizes delivery mode and channel", () => {
     const normalized = normalizeCronJobCreate({
       name: "delivery",