Supporting Listeners 0.2.0

Supporting Listeners 0.2.0

• Adds five-minute, GET-only MemberPress checkout readiness monitoring.
• Adds primary and backup failure/recovery alerts with a two-run default threshold.
• Exposes checkout status and detailed results to the authenticated Access agent.
• Adds a WordPress monitoring dashboard and pre-promotion checklist.
• Adds coverage for deliberate failures, alert routing, recovery, and zero-transaction safety.

The attached supporting-listeners-0.2.0.zip can be installed directly through WordPress.