fix(cron): add spin-loop regression coverage

CHANGELOG.md

@@ -36,6 +36,7 @@ Docs: https://docs.openclaw.ai
 - Agents/Sessions: align session lock watchdog hold windows with run and compaction timeout budgets (plus grace), preventing valid long-running turns from being force-unlocked mid-run while still recovering hung lock owners. (#18060)
 - Cron/Heartbeat: canonicalize session-scoped reminder `sessionKey` routing and preserve explicit flat `sessionKey` cron tool inputs, preventing enqueue/wake namespace drift for session-targeted reminders. (#18637) Thanks @vignesh07.
 - Cron/Webhooks: reuse existing session IDs for webhook/cron runs when the session key is stable and still fresh, preserving conversation history. (#18031) Thanks @Operative-001.
+- Cron: prevent spin loops when cron jobs complete within the scheduled second by advancing the next run and enforcing a minimum refire gap. (#18073) Thanks @widingmarcus-cyber.
 - OpenClawKit/iOS ChatUI: accept canonical session-key completion events for local pending runs and preserve message IDs across history refreshes, preventing stuck "thinking" state and message flicker after gateway replies. (#18165) Thanks @mbelinky.
 - iOS/Onboarding: add QR-first onboarding wizard with setup-code deep link support, pairing/auth issue guidance, and device-pair QR generation improvements for Telegram/Web/TUI fallback flows. (#18162) Thanks @mbelinky and @Marvae.
 - iOS/Gateway: stabilize connect/discovery state handling, add onboarding reset recovery in Settings, and fix iOS gateway-controller coverage for command-surface and last-connection persistence behavior. (#18164) Thanks @mbelinky.